Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Turbopuffer | Logrus | < 1.8.3 |
Related Weaknesses (CWE)
References
- https://github.com/mjuanxd/logrus-dos-pocExploitThird Party Advisory
- https://github.com/mjuanxd/logrus-dos-poc/blob/main/README.mdExploitThird Party Advisory
- https://github.com/sirupsen/logrus/issues/1370ExploitIssue TrackingPatch
- https://github.com/sirupsen/logrus/pull/1376Issue TrackingPatch
- https://github.com/sirupsen/logrus/releases/tag/v1.8.3Release Notes
- https://github.com/sirupsen/logrus/releases/tag/v1.9.1Release Notes
- https://github.com/sirupsen/logrus/releases/tag/v1.9.3Release Notes
- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391ExploitThird Party Advisory
FAQ
What is CVE-2025-65637?
CVE-2025-65637 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 int...
How severe is CVE-2025-65637?
CVE-2025-65637 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-65637?
Check the references section above for vendor advisories and patch information. Affected products include: Turbopuffer Logrus.