CVE-2026-115580

Summary

pypdf: Possible long runtimes for large xref table header limits

Severity

high

EPSS

0.4% (p35)

CWE

CWE-834

Also known as

GHSA-gmh7-3g9r-mjh5

Published

2026-10-23

Updated

2026-10-23

Advisory details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires opening a file with large/wrong upper limits in the xref table.

Patches

This has been fixed in pypdf==6.21.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4239.

References

• https://github.com/advisories/GHSA-gmh7-3g9r-mjh5
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5
• https://github.com/py-pdf/pypdf/pull/4239
• https://github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2
• https://github.com/py-pdf/pypdf/releases/tag/6.21.2

Related advisories

• CVE-2026-84310 — medium · PyPI/pypdf
• CVE-2026-84311 — medium · PyPI/pypdf
• CVE-2026-71852 — medium · PyPI/pypdf
• CVE-2026-115572 — high · PyPI/pypdf
• CVE-2026-115585 — high · PyPI/pypdf
• CVE-2026-102999 — high · PyPI/pypdf
• CVE-2026-102998 — high · PyPI/pypdf
• CVE-2026-103000 — high · PyPI/pypdf

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