ubuntu-cve-2026-6843
Vulnerability from osv_ubuntu
Published
2026-04-22 09:16
Modified
2026-06-05 01:03
Summary
Details

A flaw was found in nano. A local user could exploit a format string vulnerability in the statusline() function. By creating a directory with a name containing printf specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the nano application.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "nano",
            "binary_version": "6.2-1ubuntu0.2"
          },
          {
            "binary_name": "nano-tiny",
            "binary_version": "6.2-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "nano",
        "purl": "pkg:deb/ubuntu/nano@6.2-1ubuntu0.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.2-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.6.1-1build1",
        "5.9-1",
        "6.0-1",
        "6.1-1",
        "6.2-1",
        "6.2-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "nano",
            "binary_version": "7.2-2ubuntu0.2"
          },
          {
            "binary_name": "nano-tiny",
            "binary_version": "7.2-2ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nano",
        "purl": "pkg:deb/ubuntu/nano@7.2-2ubuntu0.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2-2ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.2-1",
        "7.2-2",
        "7.2-2build1",
        "7.2-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "nano",
            "binary_version": "8.4-1ubuntu0.1"
          },
          {
            "binary_name": "nano-tiny",
            "binary_version": "8.4-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nano",
        "purl": "pkg:deb/ubuntu/nano@8.4-1ubuntu0.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.4-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.3-1",
        "8.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "nano",
            "binary_version": "8.7.1-1ubuntu0.1"
          },
          {
            "binary_name": "nano-tiny",
            "binary_version": "8.7.1-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nano",
        "purl": "pkg:deb/ubuntu/nano@8.7.1-1ubuntu0.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.7.1-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.4-1",
        "8.6-1",
        "8.7-1",
        "8.7.1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in nano. A local user could exploit a format string vulnerability in the `statusline()` function. By creating a directory with a name containing `printf` specifiers, the application attempts to display this name, leading to a segmentation fault (SEGV). This results in a Denial of Service (DoS) for the `nano` application.",
  "id": "UBUNTU-CVE-2026-6843",
  "modified": "2026-06-05T01:03:25Z",
  "published": "2026-04-22T09:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6843"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6843"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460017"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455127"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8386-1"
    }
  ],
  "related": [
    "USN-8386-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-6843"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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