CVE-2026-57204

Description

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 MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.

References

• https://github.com/py-pdf/pypdf/releases/tag/6.13.3
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94