CVE-2023-36464

    Dashboard / Vulnerabilities / CVE-2023-36464

    CVE-2023-36464

    Published: 27 Jun 2023Last Modified: 12 Aug 2026

    Summary: Infinite Loop when a comment isn't followed by a character in pypdf

    Details: pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if `__parse_content_stream` is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line `while peek not in (b"\r", b"\n")` in `pypdf/generic/_data_structures.py` to `while peek not in (b"\r", b"\n", b"")`.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/36xxx/CVE-2023-36464.json, https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vvm-4w3v-6mr8, https://nvd.nist.gov/vuln/detail/CVE-2023-36464, https://github.com/py-pdf/pypdf/pull/1828, https://github.com/py-pdf/pypdf/pull/969

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -0096c99031955b15bd30834e5566076d9528f59d

    Affected versions

    3.8.1
    3.8.0

    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-2023-36464 | CVE-DB