pypdf: Possible infinite loop when processing outlines/bookmarks in writer

GHSA-m2v9-299j-rv96 · CVE-2026-54531 · PYSEC-2026-3022

Published Jun 16, 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 merging a file with outlines into a writer.

Patches

This has been fixed in pypdf==6.13.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3830.

References

WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96
WEB https://github.com/py-pdf/pypdf/pull/3830
PACKAGE https://github.com/py-pdf/pypdf
WEB https://github.com/py-pdf/pypdf/releases/tag/6.13.0

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