GHSA-jw7q-gvrg-4vj3High
pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)
🔗 CVE IDs covered (1)
📋 Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a partially malformed /FlateDecode stream, where the byte-by-byte decompression is used.
Patches
This has been fixed in pypdf==6.18.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4073.
🎯 Affected products1
- pip/pypdf:< 6.18.1
🔗 References (6)
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jw7q-gvrg-4vj3
- https://nvd.nist.gov/vuln/detail/CVE-2026-102997
- https://github.com/py-pdf/pypdf/pull/4073
- https://github.com/py-pdf/pypdf/commit/d9d38cf99b115deb562d3b68f36c33027bc04f79
- https://github.com/py-pdf/pypdf/releases/tag/6.18.1
- https://github.com/advisories/GHSA-jw7q-gvrg-4vj3