CVE-2025-65637_CVE-2025-65637

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Basic Information

ID CVE-2025-65637

Source mitre

Published Dec 4, 2025 at 00:00

Modified Dec 5, 2025 at 21:52

Affected Product

Vendor n/a

Product n/a

Version n/a

Affected Versions n/a n/a n/a

CWE Classification

CWE-400

References

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    "published": "2025-12-04T00:00:00.000Z",
    "modified": "2025-12-05T21:52:59.784Z",
    "type": "cve",
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    "references": "https://github.com/mjuanxd/logrus-dos-poc\nhttps://github.com/sirupsen/logrus/issues/1370\nhttps://github.com/sirupsen/logrus/pull/1376\nhttps://github.com/sirupsen/logrus/releases/tag/v1.8.3\nhttps://github.com/sirupsen/logrus/releases/tag/v1.9.1\nhttps://github.com/sirupsen/logrus/releases/tag/v1.9.3\nhttps://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391\nhttps://github.com/mjuanxd/logrus-dos-poc/blob/main/README.md",
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