CVE-2025-65637

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.

References

https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391

https://github.com/sirupsen/logrus/releases/tag/v1.9.3

https://github.com/sirupsen/logrus/releases/tag/v1.9.1

https://github.com/sirupsen/logrus/releases/tag/v1.8.3

https://github.com/sirupsen/logrus/pull/1376

https://github.com/sirupsen/logrus/issues/1370

https://github.com/mjuanxd/logrus-dos-poc/blob/main/README.md

https://github.com/mjuanxd/logrus-dos-poc

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS