sigstore-go — security advisory

{
  "id": "81af76201cc875db95f7aaf989bd41a172d99b2818509c8b03d35cbb89ad2aff",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54787",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-54787",
    "summary": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.",
    "evidence": "osv:DEBIAN-CVE-2026-54787",
    "products": [
      {
        "name": {
          "value": "sigstore-go",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.7.1-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.7.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.7.3-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.1.4-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.2.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.2.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.3.0-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "sigstore-go",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.2.1-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "0.7.1-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0.7.3-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0.7.3-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.0.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.1.4-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "low",
    "structured": {
      "id": "DEBIAN-CVE-2026-54787",
      "aliases": [
        "DEBIAN-CVE-2026-54787"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "sigstore-go",
            "purl": "pkg:deb/debian/sigstore-go?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "0.7.1-2",
            "0.7.3-1",
            "0.7.3-2",
            "1.0.0-1",
            "1.1.4-1",
            "1.2.1-1",
            "1.2.2-1",
            "1.3.0-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54787.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.2.1-1"
                }
              ]
            }
          ],
          "package": {
            "name": "sigstore-go",
            "purl": "pkg:deb/debian/sigstore-go?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "0.7.1-2",
            "0.7.3-1",
            "0.7.3-2",
            "1.0.0-1",
            "1.1.4-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54787.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-24T09:47:31.947957675Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-54787"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-54787"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-54787",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429008,
  "published_at": "2026-07-31T23:17:25.287+00:00"
}