CVE-2025-65637
Last modified
CVE-2025-65637 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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). EPSS estimates a 0.56% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Turbopuffer | Logrus | < 1.8.3 |
| Turbopuffer | Logrus | 1.9.0 |
| Turbopuffer | Logrus | 1.9.2 |
References
- https://github.com/mjuanxd/logrus-dos-pocExploit, Third Party Advisory
- https://github.com/mjuanxd/logrus-dos-poc/blob/main/README.mdExploit, Third Party Advisory
- https://github.com/sirupsen/logrus/issues/1370Exploit, Issue Tracking, Patch
- https://github.com/sirupsen/logrus/pull/1376Issue Tracking, Patch
- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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