pypdf: Missing stream length values ignore defined limits

GHSA-jm82-fx9c-mx94 · CVE-2026-57204

Published Jun 18, 2026 · Modified Sep 10, 2026

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Description

Impact

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.

Patches

This has been fixed in pypdf==6.13.3.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3871.

References

WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94
WEB https://github.com/py-pdf/pypdf/pull/3871
PACKAGE https://github.com/py-pdf/pypdf
WEB https://github.com/py-pdf/pypdf/releases/tag/6.13.3

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