CVE-2026-3949: strukturag libheif HEIF File decoder_vvdec.cc vvdec_push_data2 out-of-bounds
A vulnerability was determined in strukturag libheif up to 1.21.2. This affects the function vvdecpushdata2 of the file libheif/plugins/decodervvdec.cc of the component HEIF File Parser. Executing a manipulation of the argument size can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been publicly disclosed and may be utilized. This patch is called b97c8b5f198b27f375127cd597a35f2113544d03. It is advisable to implement a patch to correct this issue.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-3949?
CVE-2026-3949 is classified as a high-severity vulnerability due to the potential for out-of-bounds access in the HEIF file decoder.
How do I fix CVE-2026-3949?
To fix CVE-2026-3949, upgrade the libheif library to a version beyond 1.21.2 that includes the necessary security patches.
What are the potential impacts of CVE-2026-3949?
Exploitation of CVE-2026-3949 could lead to application crashes or arbitrary code execution when processing HEIF files.
Who is affected by CVE-2026-3949?
CVE-2026-3949 affects users and applications that utilize version 1.21.2 or earlier of the strukturag libheif library.
Is CVE-2026-3949 being actively exploited?
As of now, there are no public reports indicating active exploitation of CVE-2026-3949, but organizations should apply mitigations promptly.