CVE-2026-113794

Summary

pypdf: Possible infinite loop when hitting EOF in standard xref table

Severity

medium

EPSS

0.5% (p40)

CWE

CWE-835

Also known as

GHSA-39mj-jf6j-2qj3

Published

2026-10-21

Updated

2026-10-21

Advisory details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table.

Patches

This has been fixed in pypdf==6.20.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4170.

Notes

This has been reported through both the secure channel and as a public issue at #4169.

References

• https://github.com/advisories/GHSA-39mj-jf6j-2qj3
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3
• https://github.com/py-pdf/pypdf/issues/4169
• https://github.com/py-pdf/pypdf/pull/4170
• https://github.com/py-pdf/pypdf/commit/37e1cd681744bac38b159f7e1c614eee8d639c58
• https://github.com/py-pdf/pypdf/releases/tag/6.20.0

Related advisories

• CVE-2026-59935 — high · PyPI/pypdf
• CVE-2026-59936 — high · PyPI/pypdf
• CVE-2026-113792 — medium · PyPI/pypdf
• CVE-2026-113793 — medium · PyPI/pypdf
• CVE-2026-84309 — medium · PyPI/pypdf
• CVE-2026-54651 — medium · PyPI/pypdf
• CVE-2026-115572 — high · PyPI/pypdf
• CVE-2026-115585 — high · PyPI/pypdf

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