Vulnerability-Lookup

CVE-2026-61801 (GCVE-0-2026-61801)

Vulnerability from cvelistv5 – Published: 2026-10-08 16:22 – Updated: 2026-10-08 17:27

Title

github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files

Summary

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.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-08 17:27 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7595 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/moby/sys/security/advisories/G…	x_refsource_CONFIRM
https://github.com/moby/sys/pull/221	x_refsource_MISC
https://github.com/moby/sys/commit/85a71bbe1faa36…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
moby	sys	Affected: < 0.4.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-61801

Vulnerability from fkie_nvd - Published: 2026-10-08 17:17 - Updated: 2026-10-08 21:35

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/moby/sys/commit/85a71bbe1faa36c552a960e6a5f3d0cfb632fbbe
	security-advisories@github.com	https://github.com/moby/sys/pull/221
	security-advisories@github.com	https://github.com/moby/sys/security/advisories/GHSA-mjcv-p78q-w5fw

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "sys",
          "vendor": "moby",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.4.1"
            }
          ]
        }
      ],
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      "lang": "en",
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          "confidentialityImpact": "NONE",
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GHSA-MJCV-P78Q-W5FW

Vulnerability from github – Published: 2026-10-08 16:08 – Updated: 2026-10-08 16:08

Summary

github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files

Details

A denial-of-service (DoS) vulnerability exists in github.com/moby/sys/user before v0.4.1 when parsing specially crafted user or group database files. An attacker able to supply a malicious /etc/passwd or /etc/group-style file may cause excessive memory consumption, potentially resulting in process termination due to Out Of Memory (OOM) conditions.

This issue is related to containerd [CVE-2026-47262] / GHSA-jpcc-p29g-p8mq, which describes one practical exploitation path through processing untrusted container image content. Applications using github.com/moby/sys/user to parse untrusted user or group database files may be similarly affected.

Impact

github.com/moby/sys/user versions before v0.4.1 do not place sufficient limits on entries while parsing user and group database files. A specially crafted file may cause excessive memory consumption, potentially leading to process termination due to Out Of Memory (OOM) conditions.

Applications that use github.com/moby/sys/user to parse user-supplied or otherwise untrusted /etc/passwd or /etc/group files may be affected. The severity depends on whether an attacker can influence the contents of files being parsed.

Patches

This issue is fixed in github.com/moby/sys/user v0.4.1. Users should upgrade to v0.4.1 or later.

Workarounds

Avoid parsing attacker-controlled /etc/passwd or /etc/group-style files with affected versions of github.com/moby/sys/user.

Applications that must process untrusted user or group database files should validate and limit accepted input before parsing. Upgrading to v0.4.1 or later is the recommended remediation.

References

containerd CVE-2026-47262 / GHSA-jpcc-p29g-p8mq: https://github.com/containerd/containerd/security/advisories/GHSA-jpcc-p29g-p8mq
Fix in github.com/moby/sys/user: https://github.com/moby/sys/user/commit/210d32ba2bcb4544ee968c7f31249fe59796e60b

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/moby/sys/user"
      },
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            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
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  "aliases": [
    "CVE-2026-61801"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-08T16:08:33Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "A denial-of-service (DoS) vulnerability exists in `github.com/moby/sys/user` before v0.4.1 when parsing specially crafted user or group database files. An attacker able to supply a malicious `/etc/passwd` or `/etc/group`-style file may cause excessive memory consumption, potentially resulting in process termination due to Out Of Memory (OOM) conditions.\n\nThis issue is related to containerd [CVE-2026-47262] / [GHSA-jpcc-p29g-p8mq](https://github.com/containerd/containerd/security/advisories/GHSA-jpcc-p29g-p8mq), which describes one practical exploitation path through processing untrusted container image content. Applications using `github.com/moby/sys/user` to parse untrusted user or group database files may be similarly affected.\n\n### Impact\n\n`github.com/moby/sys/user` versions before v0.4.1 do not place sufficient limits on entries while parsing user and group database files. A specially crafted file may cause excessive memory consumption, potentially leading to process termination due to Out Of Memory (OOM) conditions.\n\nApplications that use `github.com/moby/sys/user` to parse user-supplied or otherwise untrusted `/etc/passwd` or `/etc/group` files may be affected. The severity depends on whether an attacker can influence the contents of files being parsed.\n\n### Patches\n\nThis issue is fixed in `github.com/moby/sys/user` v0.4.1. Users should upgrade to v0.4.1 or later.\n\n### Workarounds\n\nAvoid parsing attacker-controlled `/etc/passwd` or `/etc/group`-style files with affected versions of `github.com/moby/sys/user`.\n\nApplications that must process untrusted user or group database files should validate and limit accepted input before parsing. Upgrading to v0.4.1 or later is the recommended remediation.\n\n### References\n\n* containerd CVE-2026-47262 / GHSA-jpcc-p29g-p8mq: https://github.com/containerd/containerd/security/advisories/GHSA-jpcc-p29g-p8mq\n* Fix in `github.com/moby/sys/user`: https://github.com/moby/sys/user/commit/210d32ba2bcb4544ee968c7f31249fe59796e60b",
  "id": "GHSA-mjcv-p78q-w5fw",
  "modified": "2026-10-08T16:08:34Z",
  "published": "2026-10-08T16:08:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/moby/sys/security/advisories/GHSA-mjcv-p78q-w5fw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moby/sys/pull/221"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moby/sys/commit/85a71bbe1faa36c552a960e6a5f3d0cfb632fbbe"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/moby/sys"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files"
}

MSRC_CVE-2026-61801

Vulnerability from csaf_microsoft - Published: 2026-10-11 01:50 - Updated: 2026-10-11 01:50

Summary

github.com/moby/sys/user has a possible DoS via unbounded parsing of user and group database files

Scope

1 vulnerability in this advisory, including CVE-2026-61801.

CVE-2026-61801

Under investigation: 14 products

Open the full advisory

RHSA-2026:76430

Vulnerability from csaf_redhat - Published: 2026-10-05 22:17 - Updated: 2026-10-09 08:56

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-61801.

CVE-2026-61801

A flaw was found in the moby/sys/user package. The package does not properly limit memory allocation when parsing Unix-style user and group database files, such as /etc/passwd or /etc/group. An attacker who can supply a specially crafted file can cause excessive memory consumption, leading to a Denial of Service (DoS) condition by crashing the affected process.

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:76430

Open the full advisory

RHSA-2026:76448

Vulnerability from csaf_redhat - Published: 2026-10-05 22:26 - Updated: 2026-10-09 08:56

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Moderate

Scope

4 vulnerabilities in this advisory, including CVE-2026-61801.

CVE-2026-61801

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:76448

Open the full advisory

RHSA-2026:76677

Vulnerability from csaf_redhat - Published: 2026-10-06 08:26 - Updated: 2026-10-09 08:56

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-61801.

CVE-2026-61801

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:76677

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-61801 (GCVE-0-2026-61801)

FKIE_CVE-2026-61801

GHSA-MJCV-P78Q-W5FW

Impact

Patches

Workarounds

References

MSRC_CVE-2026-61801

RHSA-2026:76430

RHSA-2026:76448

RHSA-2026:76677

Tags

Sightings

Nomenclature

Related by attack behaviour