pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

GHSA-87mj-5ggw-8qc3 · CVE-2026-33699 · PYSEC-2026-3012

Published Mar 25, 2026 · Modified Sep 10, 2026

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Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode.

Patches

This has been fixed in pypdf==6.9.2.

Workarounds

If users cannot upgrade yet, consider applying the changes from PR #3693.

References

WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-33699
WEB https://github.com/py-pdf/pypdf/pull/3693
PACKAGE https://github.com/py-pdf/pypdf
WEB https://github.com/py-pdf/pypdf/releases/tag/6.9.2

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