CVE-2026-119205

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles to evade the visited-object check. This issue is fixed in version 6.21.4.

CVSS

No CVSS.

References

Link	Resource
https://github.com/py-pdf/pypdf/commit/f176db1a1f7f9af3e472e69a843ef1175653b044
https://github.com/py-pdf/pypdf/pull/4288
https://github.com/py-pdf/pypdf/releases/tag/6.21.4
https://github.com/py-pdf/pypdf/security/advisories/GHSA-mfr5-77xh-9j7h

Configurations

No configuration.

History

29 Oct 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-29 21:17

Updated : 2026-10-30 17:18

NVD link : CVE-2026-119205

Mitre link : CVE-2026-119205

CVE.ORG link : CVE-2026-119205

JSON object : View

Products Affected

No product.

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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