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CVE-2026-61801— github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files

Quick assessment

Affected
moby sys
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

包提供了用于解析和查找类 Unix 系统用户和组数据库条目（如 和 文件）的 Go 语言工具。在 0.4.1 版本之前，该包在解析此类文件时未对条目数量进行充分限制，攻击者若能够提供特制的恶意文件，可能导致 excessive memory consumption（过度内存消耗），甚至因内存耗尽（out-of-memory condition）而终止受影响进程。该问题已在 0.4.1 版本中修复。作为临时缓解措施，应避免解析由攻击者控制的 用户或组数据库文件；或在解析前对不受信任的输入进行验证并限制其大小。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
moby sys < 0.4.1 affected
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I. Basic Information for CVE-2026-61801

Vulnerability Information
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Vulnerability Title
github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moby sys < 0.4.1 -

II. Public POCs for CVE-2026-61801

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III. Intelligence Information for CVE-2026-61801

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Other References for CVE-2026-61801 (3)

IV. Related Vulnerabilities

Same vendor: moby
Same weakness: CWE-400

V. Comments for CVE-2026-61801

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