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squirrel3 — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-8258

A flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Products
squirrel3
Affected versions
3.1-4, 3.1-5, 3.1-8, 3.1-8.2, 3.1-8.3, 3.1-8.4, 3.1-8.5, 3.1-8build1
Fixed versions
Not specified
CVEs
CVE-2026-8258
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 03:20 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-8258

core-osv · Original source

Published 11 May 2026, 02:16 UTC

A flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

osv:UBUNTU-CVE-2026-8258

squirrel3

Fixed versions: Not specified

squirrel3

Fixed versions: Not specified

squirrel3

Fixed versions: Not specified

squirrel3

Fixed versions: Not specified

squirrel3

Fixed versions: Not specified

squirrel3

Fixed versions: Not specified

Complete source record
{
  "id": "7b383bfc25d3260c38f5fc821b9cf0b0dd2b1da47b97e55a2714aa901d74147c",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-8258",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-8258",
    "summary": "A flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.",
    "evidence": "osv:UBUNTU-CVE-2026-8258",
    "products": [
      {
        "name": {
          "value": "squirrel3",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.1-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.1-5",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "squirrel3",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.1-8",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "3.1-8build1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
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          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
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      {
        "name": {
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          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.1-8.2",
            "evidence": "/affected/3/versions"
          }
        ]
      },
      {
        "name": {
          "value": "squirrel3",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.1-8.3",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.1-8.4",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "3.1-8.5",
            "evidence": "/affected/4/versions"
          }
        ]
      },
      {
        "name": {
          "value": "squirrel3",
          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.1-8.2",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "3.1-8.3",
            "evidence": "/affected/5/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-8258",
      "aliases": [
        "UBUNTU-CVE-2026-8258"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "squirrel3",
            "purl": "pkg:deb/ubuntu/squirrel3?arch=source&distro=bionic",
            "ecosystem": "Ubuntu:18.04:LTS"
          },
          "versions": [
            "3.1-4",
            "3.1-5"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8258.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libsquirrel3-0",
                "binary_version": "3.1-5"
              },
              {
                "binary_name": "squirrel3",
                "binary_version": "3.1-5"
              }
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        },
        {
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          ],
          "package": {
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            "purl": "pkg:deb/ubuntu/squirrel3?arch=source&distro=focal",
            "ecosystem": "Ubuntu:20.04:LTS"
          },
          "versions": [
            "3.1-8",
            "3.1-8build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8258.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libsquirrel3-0",
                "binary_version": "3.1-8build1"
              },
              {
                "binary_name": "squirrel3",
                "binary_version": "3.1-8build1"
              }
            ]
          }
        },
        {
          "ranges": [
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              ]
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          ],
          "package": {
            "name": "squirrel3",
            "purl": "pkg:deb/ubuntu/squirrel3?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "3.1-8build1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8258.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libsquirrel3-0",
                "binary_version": "3.1-8build1"
              },
              {
                "binary_name": "squirrel3",
                "binary_version": "3.1-8build1"
              }
            ]
          }
        },
        {
          "ranges": [
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          ],
          "package": {
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            "purl": "pkg:deb/ubuntu/squirrel3?arch=source&distro=questing",
            "ecosystem": "Ubuntu:25.10"
          },
          "versions": [
            "3.1-8.2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8258.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libsquirrel3-0",
                "binary_version": "3.1-8.2"
              },
              {
                "binary_name": "squirrel3",
                "binary_version": "3.1-8.2"
              }
            ]
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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          ],
          "package": {
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            "purl": "pkg:deb/ubuntu/squirrel3?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "3.1-8.3",
            "3.1-8.4",
            "3.1-8.5"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8258.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libsquirrel3-0",
                "binary_version": "3.1-8.5"
              },
              {
                "binary_name": "squirrel3",
                "binary_version": "3.1-8.5"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "squirrel3",
            "purl": "pkg:deb/ubuntu/squirrel3?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "3.1-8.2",
            "3.1-8.3"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8258.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libsquirrel3-0",
                "binary_version": "3.1-8.3"
              },
              {
                "binary_name": "squirrel3",
                "binary_version": "3.1-8.3"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:11.353942882Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-8258"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-8258",
        "https://www.cve.org/CVERecord?id=CVE-2026-8258",
        "https://github.com/albertodemichelis/squirrel/issues/325"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-8258",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361179,
  "published_at": "2026-05-11T02:16:00+00:00"
}