Resource exhaustion in Moby Sys
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Moby Sys — versions < 0.4.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-61801?
- CVE-2026-61801 is a medium-severity vulnerability in Moby Sys, classified under Uncontrolled Resource Consumption. CVSS score: 5.5/10. Published 2026-10-08.
- How severe is CVE-2026-61801?
- Medium severity. CVSS v3 base score is 5.5 out of 10.