A NULL pointer dereference flaw was found in GStreamer's RTSP support library. The vulnerability occurs while parsing an Authorization or WWW-Authenticate header that uses Digest authentication. Specially crafted whitespace placement around a parameter's terminator can cause an internal length calculation to underflow, leading to a crash of the process parsing the header. On an RTSP server this can be triggered by a remote, unauthenticated attacker sending a single malformed request when the server has authentication enabled; the same flaw can also be triggered against an RTSP client by a malicious or compromised RTSP server. Successful exploitation results in a denial of service (application crash) and has no confirmed impact on confidentiality or integrity.

gst-plugins-base's RTSP support library (subprojects/gst-plugins-base/gst-libs/gst/rtsp/gstrtspmessage.c) implements gstrtspmessageparseauthcredentials(), used by both gst-rtsp-server (to parse a client's Authorization header, gst-rtsp-server/gst/rtsp-server/rtsp-auth.c:861, defaultauthenticate()) and by RTSP clients such as gstrtspsrc (gst-plugins-good/gst/rtsp/gstrtspsrc.c:6966) and rtspclientsink (gst-rtsp-sink/gstrtspclientsink.c:2737) to parse a server's WWW-Authenticate header. The internal helper parseauthcredentials() (gstrtspmessage.c, static function, ~line 1362) tokenizes comma-separated auth-param name=value pairs. For each parameter it computes itemend = skipitem(header) (the end of the current token, which points AT the whitespace/comma/NUL character that terminated the token, not past it), then does value = skiplws(eq + 1); authparam->value = gstrndup(value, itemend - value); (line ~1421-1425). skiplws() has no awareness of itemend: if the character skipitem() used as the token terminator happens to be whitespace, skiplws() will step over it (and any further whitespace) looking for a non-space character, potentially advancing value past itemend. This makes itemend - value a negative ptrdifft, which is implicitly converted to gsize (an unsigned 64-bit value near GMAXSIZE) when passed to gstrndup(). Because n+1 (computed inside gstrndup) wraps to 0 on the -1 case, gnew(gchar, 0) resolves to gmalloc(0), which by GLib's documented contract returns NULL; strncpy() is then invoked with this NULL destination and n=GMAXSIZE, corrupting/crashing, and even where gstrndup does return, the resulting NULL is stored into authparam->value without a NULL check. Immediately afterward the code does if (value[0] == '"') decodequotedstring(authparam->value); -- value[0] here is checked on the original (non-NULL) source pointer, so the branch can be taken even though authparam->value is NULL, and decodequotedstring() dereferences the NULL pointer, causing SIGSEGV. Reporter (Roy Lau, royworking98) reported this to the GStreamer security contacts on 2026-08-26 (gitlab.freedesktop.org/gstreamer/gstreamer/-/workitems/5278), and the maintainers merged a fix at gitlab.freedesktop.org/gstreamer/gstreamer-security/-/mergerequests/120 on 2026-09-02, targeting the 1.28.7 release. Reporter tested against gstreamer <= 1.28.2; the vulnerable code path is present up to (and reportedly including) versions prior to 1.28.7. Verified independently via static source review against the 1.28.2 tag; dynamic PoC execution was not performed. PSIRT Ticket: PSIRTSUPT-23042 (GST-SA-2026-0082).

GStreamer rtpsbcdepay Use-After-Free Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the processing of RTP payload elements. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29787.

GStreamer MRF File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29510.

GStreamer PNG File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of PNG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29581.

GStreamer MRF File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29608.

GStreamer OGG File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of OGG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29584.

A flaw was found in GStreamer gst-plugins-good (avidemux). In gstavidemuxriffparsevprp(), the number of available gstriffvprpvideofielddesc entries is calculated by dividing the remaining buffer size by the attacker-controlled vprp->fields value, rather than by sizeof(gstriffvprpvideofielddesc). This can cause the parser to treat more field descriptors as available than fit in the input buffer, resulting in out-of-bounds reads. Processing a crafted AVI via playbin/decodebin can crash the application (denial of service). Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072).

A flaw was found in GStreamer gst-plugins-good (avidemux). When parsing FUJIFILM metadata in an AVI strd chunk, gstavidemuxparsestrd() decrements a remaining-length counter by fixed offsets (98 and 10 bytes) without verifying sufficient data remains. For crafted strd payloads of exactly 106 or 107 bytes, the counter underflows to a very large unsigned value, causing subsequent null-terminated string scanning to read far beyond the allocated heap buffer. Date-format normalization may also write beyond the buffer end. Confirmed impacts include heap out-of-bounds read, out-of-bounds write, heap information disclosure (adjacent data appearing in parsed metadata), and application crash/denial of service. The avidemux element is auto-plugged by playbin, decodebin, and gst-discoverer, so opening or previewing a crafted AVI is sufficient to trigger the issue. Fixed upstream in gst-plugins-good 1.28.6 (GStreamer-SA-2026-0072).

A flaw was found in GStreamer gst-plugins-ugly (asfdemux). The ASF demuxer performed arithmetic on attacker-controlled length and size fields from ASF/WMV/WMA headers using 32-bit unsigned operations without adequate overflow and underflow checks. In gstasfdemuxprocessmetadata(), summing namelen and datalen could wrap, bypassing the available-data check and causing gconvert() to read beyond the heap buffer during UTF-16LE to UTF-8 conversion. Related underflow issues in other header parsers similarly produced oversized lengths and out-of-bounds reads. Because asfdemux is auto-plugged by playbin and decodebin, processing a crafted file can crash the application (denial of service) and may enable limited heap information disclosure via metadata handling. Fixed upstream in gst-plugins-ugly 1.28.6 (GStreamer-SA-2026-0075).

A flaw was found in GStreamer gst-plugins-ugly (asfdemux). The ASF demuxer performed arithmetic on attacker-controlled length and size fields from ASF/WMV/WMA headers using 32-bit unsigned operations without adequate overflow and underflow checks. In gstasfdemuxprocessmetadata(), summing namelen and datalen could wrap, bypassing the available-data check and causing gconvert() to read beyond the heap buffer during UTF-16LE to UTF-8 conversion. Related underflow issues in other header parsers similarly produced oversized lengths and out-of-bounds reads. Because asfdemux is auto-plugged by playbin and decodebin, processing a crafted file can crash the application (denial of service) and may enable limited heap information disclosure via metadata handling. Fixed upstream in gst-plugins-ugly 1.28.6 (GStreamer-SA-2026-0075).

A flaw was found in GStreamer gst-plugins-bad (adpcmdec). The IMA/DVI ADPCM decoder validated the per-block sample count with (nsamples - channels) % 8 == 0, which does not ensure alignment with the decode loop that writes 8 channels samples per iteration. A crafted multi-channel IMA ADPCM WAV can pass this check and cause a heap out-of-bounds write of decoded sample values that are partially derived from attacker-controlled compressed audio data. The adpcmdec element is auto-plugged by decodebin/playbin, so processing untrusted media (players, thumbnailers, transcoders) can trigger the issue, resulting in application crash, denial of service, memory corruption, or potentially code execution. Fixed upstream in gst-plugins-bad 1.28.6 (GStreamer-SA-2026-0077).

A flaw was found in GStreamer gst-plugins-bad (adpcmdec). The IMA/DVI ADPCM decoder validated the per-block sample count with (nsamples - channels) % 8 == 0, which does not ensure alignment with the decode loop that writes 8 channels samples per iteration. A crafted multi-channel IMA ADPCM WAV can pass this check and cause a heap out-of-bounds write of decoded sample values that are partially derived from attacker-controlled compressed audio data. The adpcmdec element is auto-plugged by decodebin/playbin, so processing untrusted media (players, thumbnailers, transcoders) can trigger the issue, resulting in application crash, denial of service, memory corruption, or potentially code execution. Fixed upstream in gst-plugins-bad 1.28.6 (GStreamer-SA-2026-0077).

GStreamer gst-plugins-good contains an unbounded memory growth vulnerability in the rtph264depay and rtph265depay RTP depayloaders. In gstrtph264depay.c, the FU-A/FU-B fragmentation handler (case 28/29 in gstrtph264depayprocess()) accumulates incoming RTP fragment payloads into a GstAdapter via gstadapterpush() without enforcing any maximum reassembly size. The adapter is only flushed when the E (end) bit is set in the FU header, which triggers gstrtph264finishfragmentationunit(). If an attacker sends a start fragment (S=1, E=0) followed by an unlimited stream of continuation fragments (S=0, E=0) with sequential RTP sequence numbers, the adapter grows without bound until process memory is exhausted. The same flaw exists in gstrtph265depay.c in the FU handler (case 49 in gstrtph265depayprocess()). The GStreamer security team confirmed the vulnerability and that rtph265depay is also affected. A fix is pending in private security Merge Request 113, planned for release in GStreamer 1.28.6 or 1.28.7. Confirmed on GStreamer 1.28.2 and 1.28.5 (dynamic testing). Reported by Yehia Ali Mohamed Ezzat (yehiaezzat710). PSIRT Ticket: PSIRTSUPT-20847.

GStreamer qtdemux Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the parsing of UncompressedFrameConfigBox structures. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29392.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of PNG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of PNG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the processing of RTP payload elements. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the processing of RTP payload elements. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of OGG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of OGG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

GStreamer MRF File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29510.

GStreamer PNG File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of PNG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29581.

GStreamer MRF File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of MRF files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29608.

GStreamer OGG File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of OGG files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29584.

GStreamer rtpsbcdepay Use-After-Free Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the processing of RTP payload elements. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29787.