CVE-2026-71852

Summary

pypdf: Possible long runtimes/large memory usage for large CID font width ranges

Severity

medium

EPSS

0.1% (p2)

CWE

CWE-834

Also known as

GHSA-fwg2-594c-jp42

Published

2026-08-07

Updated

2026-08-07

Advisory details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the font width entries of a font with unusually large values, for example during text extraction.

Patches

This has been fixed in pypdf==6.15.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3946.

References

• https://github.com/advisories/GHSA-fwg2-594c-jp42
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-fwg2-594c-jp42
• https://github.com/py-pdf/pypdf/pull/3946
• https://github.com/py-pdf/pypdf/commit/51cb6acf9e8a35b77e90b4d87d28fe3e1416d7d7
• https://github.com/py-pdf/pypdf/releases/tag/6.15.0

Related advisories

• CVE-2026-115580 — high · PyPI/pypdf
• CVE-2026-84310 — medium · PyPI/pypdf
• CVE-2026-84311 — 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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