{"id":"UBUNTU-CVE-2026-61801","details":"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.","modified":"2026-10-14T03:23:11.855940849Z","published":"2026-10-13T00:00:00Z","upstream":["CVE-2026-61801"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-61801"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-61801"},{"type":"REPORT","url":"https://github.com/moby/sys/commit/85a71bbe1faa36c552a960e6a5f3d0cfb632fbbe"},{"type":"REPORT","url":"https://github.com/moby/sys/pull/221"},{"type":"REPORT","url":"https://github.com/moby/sys/security/advisories/GHSA-mjcv-p78q-w5fw"}],"affected":[{"package":{"name":"golang-github-moby-sys","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/golang-github-moby-sys?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20201113.5a29239-1","0.0~git20220215.b8d8fab-1","0.0~git20220215.b8d8fab-2"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-moby-sys-dev","binary_version":"0.0~git20220215.b8d8fab-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61801.json"}},{"package":{"name":"golang-github-moby-sys","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/golang-github-moby-sys?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20220606.416188a-1","0.0~git20231105.a4e0878-1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-moby-sys-dev","binary_version":"0.0~git20231105.a4e0878-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61801.json"}},{"package":{"name":"golang-github-moby-sys","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/golang-github-moby-sys?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20241107.638aa7c-2","0.0~git20250819.9dc3a90-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.0~git20250819.9dc3a90-1","binary_name":"golang-github-moby-sys-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-61801.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}