CVE-2026-119205

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    CVE-2026-119205

    Published: 29 Oct 2026Last Modified: 4 Nov 2026

    Summary: pypdf: Possible infinite loop when cloning dictionaries

    Details: 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.

    References: https://github.com/py-pdf/pypdf/releases/tag/6.21.4, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119205.json, https://github.com/py-pdf/pypdf/security/advisories/GHSA-mfr5-77xh-9j7h, https://nvd.nist.gov/vuln/detail/CVE-2026-119205, https://github.com/py-pdf/pypdf/commit/f176db1a1f7f9af3e472e69a843ef1175653b044, https://github.com/py-pdf/pypdf/pull/4288

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -b2c3fa2ee689f582a0de256a45e30bd96c68f807

    Affected versions

    6.21.3
    6.21.2
    6.21.1
    6.21.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-119205 | CVE-DB