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Vulnerability record · CVE-2025-65637 · published 4 December 2025

CVE-2025-65637: Turbopuffer logrus uncontrolled resource consumption vulnerability

Turbopuffer · Logrus

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.

7.5 CVSS 3.1 High EPSS 0.63% · top 52.0% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2025-65637), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.