Bug 2548481

Summary: CVE-2026-61801 runc: moby/sys/user: Denial of Service via crafted user or group database files [fedora-all]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: runcAssignee: Kirill Kolyshkin <kolyshkin>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: amurdaca, bbaude, bradley.g.smith, dwalsh, go-sig, gscrivan, jchaloup, kolyshkin, pehunt
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["33d51d5c-d0f9-4ec6-b07d-e05ccc203c89"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2548048    

Description Ronit Dey 2026-10-09 11:12:04 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.