CVE-2026-27025

UNKNOWN 0.0

pypdf has possible long runtimes/large memory usage for large /ToUnicode streams

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. This vulnerability is fixed in 6.7.1.

CWE	CWE-834
Vendor	py-pdf
Product	pypdf
Published	Feb 20, 2026
Last Updated	Feb 24, 2026

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Affected Versions

py-pdf / pypdf

< 6.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3 github.com: https://github.com/py-pdf/pypdf/pull/3646 github.com: https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.7.1