CVE-2025-65637

HIGH EPSS 42.6%
Published Dec 4, 20256mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Dec 4, 2025 6mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
42.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 3

VendorProductVersionRange
turbopufferlogrus* <1.8.3
turbopufferlogrus1.9.0any
turbopufferlogrus1.9.2any

References 8

  • github.com https://github.com/mjuanxd/logrus-dos-poc
    ExploitThird Party Advisory
  • github.com https://github.com/mjuanxd/logrus-dos-poc/blob/main/README.md
    ExploitThird Party Advisory
  • github.com https://github.com/sirupsen/logrus/issues/1370
    ExploitIssue TrackingPatch
  • github.com https://github.com/sirupsen/logrus/pull/1376
    Issue TrackingPatch
  • github.com https://github.com/sirupsen/logrus/releases/tag/v1.8.3
    Release Notes
  • github.com https://github.com/sirupsen/logrus/releases/tag/v1.9.1
    Release Notes
  • github.com https://github.com/sirupsen/logrus/releases/tag/v1.9.3
    Release Notes
  • security.snyk.io https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391
    ExploitThird Party Advisory

Remediation

  • github.com https://github.com/sirupsen/logrus/issues/1370
    ExploitIssue TrackingPatch
  • github.com https://github.com/sirupsen/logrus/pull/1376
    Issue TrackingPatch