UNKNOWN PyPI
pypdf: Possible large memory usage for large /ToUnicode streams
PYSEC-2026-3655 · CVE-2026-71870 · GHSA-fp3f-mc75-235c
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Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /ToUnicode entry 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 #3944.
References
- WEB https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c
- WEB https://github.com/py-pdf/pypdf/pull/3944
- WEB https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa
- PACKAGE https://github.com/py-pdf/pypdf
- WEB https://github.com/py-pdf/pypdf/releases/tag/6.15.0
- PACKAGE https://pypi.org/project/pypdf
- ADVISORY https://github.com/advisories/GHSA-fp3f-mc75-235c
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-71870
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