Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page with a not terminated inline image, as done when extracting the page text for example. It only affects the ASCII85 and ASCIIHex filters.
Patches
This has been fixed in pypdf==6.14.2.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3892.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file.
Patches
This has been fixed in pypdf==6.7.2.
Workarounds
If users cannot upgrade yet, consider applying the changes from PR #3655.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter.
Patches This has been fixed in pypdf==6.7.4.
Workarounds If you cannot upgrade yet, consider applying the changes from PR #3664.
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large /Size values or object streams with wrong large /N values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessary elements.
Patches This has been fixed in pypdf==6.12.1.
Workarounds If you cannot upgrade yet, consider applying the changes from PR #3796.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer.
Patches
This has been fixed in pypdf==6.13.1.
Workarounds
If users cannot upgrade yet, consider applying the changes from PR #3839.
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAXDECLAREDSTREAMLENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.
Patches
This has been fixed in pypdf==6.14.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3887.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires loading images where the declared size values are much too large compared to the actual data.
Patches
This has been fixed in pypdf==6.14.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3888.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream.
Patches This has been fixed in pypdf==6.8.0.
Workarounds If you cannot upgrade yet, consider applying the changes from PR #3675.
As far as we are aware, this mostly affects reading from buffers of unknown size, as returned by open("file.pdf", mode="rb") for example. Passing a file path or a BytesIO buffer to pypdf instead does not seem to trigger the vulnerability.
Impact An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the xfa property of a reader or writer and the corresponding stream being compressed using /FlateDecode.
Patches This has been fixed in pypdf==6.7.3.
Workarounds If projects cannot upgrade yet, consider applying the changes from PR #3658.
Impact An attacker who exploits this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected.
Patches This has been fixed in pypdf==6.6.0.
Workarounds
python from pypdf import PdfReader, PdfWriter
Instead of reader = PdfReader("file.pdf") use the strict mode: reader = PdfReader("file.pdf", strict=True)
Instead of writer = PdfWriter(clonefrom="file.pdf") use an explicit strict reader: writer = PdfWriter(clonefrom=PdfReader("file.pdf", strict=True))
Resources This issue has been fixed in #3594.
Impact An attacker who exploits this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected.
Patches This has been fixed in pypdf==6.6.0.
Workarounds
python from pypdf import PdfReader, PdfWriter
Instead of reader = PdfReader("file.pdf") use the strict mode: reader = PdfReader("file.pdf", strict=True)
Instead of writer = PdfWriter(clonefrom="file.pdf") use an explicit strict reader: writer = PdfWriter(clonefrom=PdfReader("file.pdf", strict=True))
Resources This issue has been fixed in #3594.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values.
Patches
This has been fixed in pypdf==6.12.0.
Workarounds
If developers are unable to upgrade their apps immediately, they should consider applying the changes from PR #3791.
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer /Size value in incremental mode. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing a stream compressed using /FlateDecode with a /Predictor unequal 1 and large predictor parameters. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing an image using /FlateDecode with large size values. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets.
Patches
This has been fixed in pypdf==6.12.0.
Workarounds
If developers are unable to immediately upgrade, they should consider applying the changes from PR #3790.