CVE-2026-27025

MEDIUM6.9

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

Published Feb 20, 2026

Modified 1 weeks ago

Details

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.

References

WEB

https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2

WEB

https://github.com/py-pdf/pypdf/pull/3646

WEB

https://github.com/py-pdf/pypdf/releases/tag/6.7.1

WEB

https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-27025

CVSS Analysis