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.
History

Fri, 09 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-770
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 09 Oct 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Moby
Moby sys
Vendors & Products Moby
Moby sys

Thu, 08 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 08 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-08T16:22:25.558Z

Updated: 2026-10-08T17:27:37.645Z

Reserved: 2026-07-10T20:06:05.617Z

Link: CVE-2026-61801

cve-icon Vulnrichment

Updated: 2026-10-08T17:27:34.657Z

cve-icon NVD

Status : Deferred

Published: 2026-10-08T17:17:17.433

Modified: 2026-10-08T21:35:53.890

Link: CVE-2026-61801

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T16:22:25Z

Links: CVE-2026-61801 - Bugzilla