PYSEC-2026-3911

    Dashboard / Vulnerabilities / PYSEC-2026-3911

    PYSEC-2026-3911

    Published: 10 Sept 2026Last Modified: 10 Sept 2026

    Summary: pypdf: Possible long runtimes/large memory usage when extracting XForm objects

    Details: ### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires extracting the text of a page with lots of XForm objects, where some of them might be re-used. ### Patches This has been fixed in [pypdf==6.16.1](https://github.com/py-pdf/pypdf/releases/tag/6.16.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3966](https://github.com/py-pdf/pypdf/pull/3966).

    References: https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2, https://github.com/py-pdf/pypdf/pull/3966, https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942, https://github.com/py-pdf/pypdf, https://github.com/py-pdf/pypdf/releases/tag/6.16.1, https://pypi.org/project/pypdf, https://github.com/advisories/GHSA-763m-79hh-57f2, https://nvd.nist.gov/vuln/detail/CVE-2026-84311

    Affected packages

    Package

    Name: pypdf

    Purl: pkg:pypi/pypdf

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -6.16.1

    Affected versions

    1.0

    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
    PYSEC-2026-3911 | CVE-DB