GHSA-4f99-4q7p-p3gh

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    GHSA-4f99-4q7p-p3gh

    Published: 4 Dec 2025Last Modified: 10 Sept 2026

    Summary: Logrus is vulnerable to DoS when using Entry.Writer()

    Details: A denial-of-service vulnerability exists in github.com/sirupsen/logrus when using Entry.Writer() to log a single-line payload larger than 64KB without newline characters. Due to limitations in the internal bufio.Scanner, the read fails with "token too long" and the writer pipe is closed, leaving Writer() unusable and causing application unavailability (DoS). This affects versions < 1.8.3, 1.9.0, and 1.9.2. The issue is fixed in 1.8.3, 1.9.1, and 1.9.3+, where the input is chunked and the writer continues to function even if an error is logged.

    References: https://nvd.nist.gov/vuln/detail/CVE-2025-65637, https://github.com/sirupsen/logrus/issues/1370, https://github.com/sirupsen/logrus/pull/1376, https://github.com/sirupsen/logrus/commit/6acd903758687c4a3db3c11701e6c414fcf1c1f7, https://github.com/mjuanxd/logrus-dos-poc, https://github.com/mjuanxd/logrus-dos-poc/blob/main/README.md, https://github.com/sirupsen/logrus, https://github.com/sirupsen/logrus/releases/tag/v1.8.3, https://github.com/sirupsen/logrus/releases/tag/v1.9.1, https://github.com/sirupsen/logrus/releases/tag/v1.9.3, https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391

    Affected packages

    Package

    Name: github.com/sirupsen/logrus

    Purl: pkg:golang/github.com/sirupsen/logrus

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -1.8.3

    Affected versions

    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
    GHSA-4f99-4q7p-p3gh | CVE-DB