CVE-2026-61801: Golang github moby sys · The github.com/moby/sys/user package provides Go utilities for parsing and
Affects golang-github-moby-sysSource GCVE Database
Not known to be exploited · CVSS 5.5 Medium · fixed in 0.4.1 : update golang-github-moby-sys when convenient.
Data as of 9 Nov 2026, 14:18 UTC
- Patch
- Available – fixed in 0.4.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 8 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10golang-github-moby-syspkg:deb/ubuntu/golang-github-moby-sys?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSgolang-github-moby-syspkg:deb/ubuntu/golang-github-moby-sys?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSgolang-github-moby-syspkg:deb/ubuntu/golang-github-moby-sys?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available in version 0.4.1 of the github.com/moby/sys/user package. Users should upgrade to version 0.4.1 or later. As a workaround, avoid parsing user or group database files from untrusted sources or validate and limit untrusted input before parsing it.
Description
The golang github.com/moby/sys/user package before version 0.4.1 has a vulnerability where it does not sufficiently limit entries when parsing Unix-style user and group database files. This can allow an attacker who supplies a specially crafted file to cause excessive memory consumption, potentially leading to process termination due to out-of-memory conditions. The issue is fixed in version 0.4.1. Mitigation includes avoiding parsing untrusted user or group database files or validating and limiting such input before parsing.
References
- ubuntu.com/security/CVE-2026-61801 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-61801 (opens in a new tab)
- github.com/moby/sys/commit/85a71bbe1faa36c552a960e6a5f3d0cfb632fbbe (opens in a new tab)
- github.com/moby/sys/pull/221 (opens in a new tab)
- github.com/moby/sys/security/advisories/GHSA-mjcv-p78q-w5fw (opens in a new tab)