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High, CVSS 8.7

Logrus is vulnerable to DoS when using Entry.Writer()

CVE-2025-65637GHSA-4f99-4q7p-p3gh

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/sirupsen/logrus 1.9.3, 1.9.1, 1.8.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2025-65637: 0.63% estimated exploitation activity in the next 30 days; percentile 50.22 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-4f99-4q7p-p3gh

Agent brief

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# Patch Next advisory brief: CVE-2025-65637

Advisory: Logrus is vulnerable to DoS when using Entry.Writer()
IDs: CVE-2025-65637, GHSA-4f99-4q7p-p3gh
Record: https://patchnext.com/advisories/cve-2025-65637 (revision 1, source checked 26 Oct 2026, 15:13 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/sirupsen/logrus 1.9.3, 1.9.1, 1.8.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/sirupsen/logrus: affected < 1.8.3; >= 1.9.0, <= 1.9.0; >= 1.9.2, <= 1.9.2; fixed in 1.8.3, 1.9.3, 1.9.1

## Suggested inspection (read-only)
- Go github.com/sirupsen/logrus: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/sirupsen/logrus.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4f99-4q7p-p3gh (GitHub-reviewed advisory GHSA-4f99-4q7p-p3gh lists affected ranges: Go github.com/sirupsen/logrus >=0 =1.9.0 =1.9.2 <=1.9.2)

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