CVE-2026-115572

Summary

pypdf: Possible long runtimes for repeated references to the same missing object

Severity

high

EPSS

0.4% (p31)

CWE

CWE-400

Also known as

GHSA-6c7f-9265-g8fw

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 loading relevant parts of a file (like their pages) where the same, but non-existent indirect object is referenced multiple times.

Patches

This has been fixed in pypdf==6.21.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4240.

References

• https://github.com/advisories/GHSA-6c7f-9265-g8fw
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-6c7f-9265-g8fw
• https://github.com/py-pdf/pypdf/pull/4240
• https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b
• https://github.com/py-pdf/pypdf/releases/tag/6.21.2

Related advisories

• CVE-2026-115585 — high · PyPI/pypdf
• CVE-2026-102999 — high · PyPI/pypdf
• CVE-2026-102998 — high · PyPI/pypdf
• CVE-2026-103000 — high · PyPI/pypdf
• CVE-2026-102997 — high · PyPI/pypdf
• CVE-2026-102996 — high · PyPI/pypdf
• CVE-2026-102995 — high · PyPI/pypdf
• CVE-2026-102994 — high · PyPI/pypdf

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