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CVE-2025-65637

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.

Published Dec 4, 2025CWE-400EPSS 0.63%

Overview

CVE-2025-65637 is a high-severity vulnerability. It was published on December 4, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mjuanxd/logrus-dos-pocGitHubgithub.com/mjuanxd/logrus-dos-poc/blob/main/README.mdGitHubgithub.com/sirupsen/logrus/issues/1370GitHubgithub.com/sirupsen/logrus/pull/1376GitHubgithub.com/sirupsen/logrus/releases/tag/v1.8.3GitHubgithub.com/sirupsen/logrus/releases/tag/v1.9.1GitHubgithub.com/sirupsen/logrus/releases/tag/v1.9.3Refsecurity.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSIRUPSENLOGRUS-5564391

How CyberStrike helps

Frequently asked questions

What is CVE-2025-65637?

CVE-2025-65637 is a high-severity vulnerability. It was published on December 4, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-65637?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-65637?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-65637?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-65637 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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