Vulnerability-Lookup

CVE-2026-65610 (GCVE-0-2026-65610)

Vulnerability from cvelistv5 – Published: 2026-08-19 13:21 – Updated: 2026-08-20 15:57 X_Open Source

Title

Numeric Truncation Error in nnn

Summary

nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.

Severity

2.4 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 15:32 UTC

CWE

CWE-197 - Numeric truncation error

Assigner

CERT-PL ENISA root

References

1 reference

URL	Tags
https://cert.pl/en/posts/2026/08/CVE-2026-65609	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
nnn	nnn	Affected: 5.2 (git)	guessed

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-65610

Vulnerability from fkie_nvd - Published: 2026-08-19 14:17 - Updated: 2026-08-28 15:26

Severity

2.4 (Low) - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	cvd@cert.pl	https://cert.pl/en/posts/2026/08/CVE-2026-65609

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-2FQ9-P2VJ-RC2V

Vulnerability from github – Published: 2026-08-19 15:32 – Updated: 2026-08-19 15:32

Details

Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.

Severity

2.4 (Low)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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    "github_reviewed_at": null,
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    "severity": "LOW"
  },
  "details": "nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim\u0027s execution environment can provide\u00a0an arbitrary HOME path with length\u00a0that is truncated\u00a0to 0. The expression (homelen - 1) is promoted to signed int and\u00a0becomes -1 and producing an\u00a0out-of-bounds read and an out-of-bounds write one byte before the path buffer.\u00a0\n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.",
  "id": "GHSA-2fq9-p2vj-rc2v",
  "modified": "2026-08-19T15:32:26Z",
  "published": "2026-08-19T15:32:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65610"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/08/CVE-2026-65609"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

ubuntu-cve-2026-65610

Vulnerability from osv_ubuntu

Published

2026-08-19 14:17

Modified

2026-09-02 16:22

Summary

Details

Severity

2.4 (Low)


                    
                      CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-65610	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-65610	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nnn",
            "binary_version": "1.7-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "nnn",
        "purl": "pkg:deb/ubuntu/nnn@1.7-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3-2",
        "1.5-1",
        "1.6-1",
        "1.7-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nnn",
            "binary_version": "3.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nnn",
        "purl": "pkg:deb/ubuntu/nnn@3.0-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6-1",
        "2.7-1",
        "2.8-1",
        "2.8.1-1",
        "2.9-1",
        "3.0-1",
        "3.0-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nnn",
            "binary_version": "4.3-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nnn",
        "purl": "pkg:deb/ubuntu/nnn@4.3-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5-1",
        "4.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nnn",
            "binary_version": "4.9-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nnn",
        "purl": "pkg:deb/ubuntu/nnn@4.9-1build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.8-1",
        "4.9-1",
        "4.9-1build1",
        "4.9-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nnn",
            "binary_version": "5.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nnn",
        "purl": "pkg:deb/ubuntu/nnn@5.1-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.0-1",
        "5.1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim\u0027s execution environment can provide\u00a0an arbitrary HOME path with length\u00a0that is truncated\u00a0to 0. The expression (homelen - 1) is promoted to signed int and\u00a0becomes -1 and producing an\u00a0out-of-bounds read and an out-of-bounds write one byte before the path buffer. Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.",
  "id": "UBUNTU-CVE-2026-65610",
  "modified": "2026-09-02T16:22:32Z",
  "published": "2026-08-19T14:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-65610"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-65610"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-65610"
  ]
}

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.

Action not permitted

CVE-2026-65610 (GCVE-0-2026-65610)

FKIE_CVE-2026-65610

GHSA-2FQ9-P2VJ-RC2V

ubuntu-cve-2026-65610

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour