CVE-2026-27026

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

5.5 / 10

Vector String

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

Vulnerability 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. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

Vulnerability Details

Published Date

February 18, 2026

Last Modified

February 24, 2026

CWE ID

CWE-770

Source

GitHub

Vendor

pip

Product

pypdf

External References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h
https://github.com/py-pdf/pypdf/pull/3644
https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016
https://github.com/py-pdf/pypdf/releases/tag/6.7.1
https://github.com/advisories/GHSA-9mvc-8737-8j8h

CVE-2026-27026

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

Discussion (0)

Add Comment