Vulnerability-Lookup

GHSA-86J5-WH4F-79GM

Vulnerability from github – Published: 2026-03-13 21:31 – Updated: 2026-03-21 21:31

Details

In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the 'password' variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments.

Severity

7.4 (High)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2025-71263"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-13T19:53:53Z",
    "severity": "HIGH"
  },
  "details": "In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the \u0027password\u0027 variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments.",
  "id": "GHSA-86j5-wh4f-79gm",
  "modified": "2026-03-21T21:31:26Z",
  "published": "2026-03-13T21:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71263"
    },
    {
      "type": "WEB",
      "url": "https://discuss.systems/@ricci/115747843169814700"
    },
    {
      "type": "WEB",
      "url": "https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow"
    },
    {
      "type": "WEB",
      "url": "https://www.spinellis.gr/blog/20251223"
    },
    {
      "type": "WEB",
      "url": "https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/20/6"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/21/4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-71263 (GCVE-0-2025-71263)

Vulnerability from cvelistv5 – Published: 2026-03-13 18:38 – Updated: 2026-03-21 22:00 Unsupported When Assigned

Summary

Severity

7.4 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-13 19:36 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

mitre mitre root

References

6 references

URL	Tags
https://sigma-star.at/blog/2025/12/unix-v4-buffer…
https://www.tuhs.org/pipermail/tuhs/2026-January/…
https://discuss.systems/@ricci/115747843169814700
https://www.spinellis.gr/blog/20251223/
http://www.openwall.com/lists/oss-security/2026/03/20/6
http://www.openwall.com/lists/oss-security/2026/03/21/4

Impacted products

1 product

Vendor	Product	Version
AT&T Bell Labs	UNIX	Affected: 4 (custom)

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

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.