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CVE intelligence

CVE-2026-61801

Vulnerability intelligence

Published Oct 8, 2026Sources checked Oct 21, 2026
5.5MEDIUMCVSS out of 10
What this means

Review the available evidence

CVE-2026-61801 and is rated Medium severity with a CVSS score of 5.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 21, 2026
Vendor remediation details

Release Notes

Vendor-listed releases

  • 2.3.7-1
  • 1.62.0-9
  • 2.27.0-16
  • 1.8.4-4
  • 25.0.18-1
  • 1.4.3-2
  • 1.14.4-14
  • 1.31.0-35
CISA KEVNot listedBased on the latest collected catalog
EPSS0.1%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview

What is CVE-2026-61801?

The `github.com/moby/sys/user` package provides Go utilities for parsing and looking up entries in Unix-style user and group database files.

Versions before 0.4.1 do not sufficiently limit entries when parsing `/etc/passwd`- or `/etc/group`-style files, allowing an attacker who can supply a specially crafted file to cause excessive memory consumption and potentially terminate the affected process due to an out-of-memory condition. This issue is patched in version 0.4.1.

As a workaround, avoid parsing attacker-controlled user or group database files, or validate and limit untrusted input before parsing it.

Source: NVD