CVE-2025-65637

Aliases:GHSA-4f99-4q7p-p3ghGO-2025-4188
Advisory lineage Upstream: 0 Downstream: 32
Analyzed
Published: 04 Dec 2025, 00:00
Last modified:05 Dec 2025, 21:52

Vulnerability Summary

Overall Risk (default)
medium
40/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
0.06% LOW
0% probability +0.02%
KEV
Not listed
Ransomware
No reports
Public exploits
3 found
Dark Web
Not detected

Timeline

04 Dec 2025, 00:00
Published
Vulnerability first disclosed
05 Dec 2025, 21:52
Last Modified
Vulnerability information updated

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 Metrics

  • v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.06%• Percentile: 17%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • github.com/sirupsen•logrus

    < 1.8.3 | ≥ 1.9.0, < 1.9.1 | ≥ 1.9.2, < 1.9.3

  • turbopuffer•logrus

    < 1.8.3 | 1.9.0 | 1.9.2

References (12)