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 an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-996q-pr4m-cvgq pypdf has a possible infinite loop when processing TreeObject
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sat, 21 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

threat_severity

Moderate


Fri, 20 Feb 2026 21:30:00 +0000

Type Values Removed Values Added
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 an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.
Title pypdf has a possible infinite loop when processing TreeObject
Weaknesses CWE-835
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-20T21:10:07.864Z

Reserved: 2026-02-17T03:08:23.490Z

Link: CVE-2026-27024

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-20T22:16:28.687

Modified: 2026-02-20T22:16:28.687

Link: CVE-2026-27024

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-20T21:10:07Z

Links: CVE-2026-27024 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses