CVE-2026-27025

MediumCVSS 5.5/10Last modified Nov 2, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-834

Affected software

Vendor	Product	Versions
py-pdf	pypdf	< 6.7.1

References

https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2Patch
https://github.com/py-pdf/pypdf/pull/3646Issue Tracking, Patch
https://github.com/py-pdf/pypdf/releases/tag/6.7.1Product, Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3Patch, Vendor Advisory

Timeline

Published: Feb 20, 2026
Last modified: Nov 2, 2026
NVD status: Analyzed

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