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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: < 6.21.1
Patched in 6.21.1
Details
An attacker who uses this vulnerability can craft a PDF which leads to arbitrary image parsers being called. This requires loading an image which claims to use the /DCTDecode filter (JPEG data).
Users which do not have the optional Pillow dependency installed in their environment are not affected.
This has been fixed in pypdf==6.21.1.
If you cannot upgrade yet, consider applying the changes from PR #4222.
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A secure code review or supply chain review finds this before an advisory does.