CVE-2026-27025

Description

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.

Affected Platforms

Weakness Type

CWE-834

References

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