Gitea denial of service through external issue tracker patterns

{
  "id": "8b532ee635f7199315161299baae7ecc6414dbb4e9fb9492ead056ed0c7bd5e7",
  "url": "https://osv.dev/vulnerability/BIT-gitea-2026-96399",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea denial of service through external issue tracker patterns",
    "summary": "A repository's external issue tracker regular expression containing alternating capture groups could produce invalid slice indexes when Gitea rendered issue references, causing a runtime panic that terminated the Gitea process. A user who can edit a repository's external issue tracker settings could make any later rendering of matching content, such as viewing a README, crash the instance for all users.",
    "evidence": "osv:BIT-gitea-2026-96399",
    "products": [
      {
        "name": {
          "value": "gitea",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "28.0.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-gitea-2026-96399",
      "aliases": [
        "BIT-gitea-2026-96399",
        "CVE-2026-96399",
        "GHSA-mw6q-qj47-9g5q"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "28.0.0"
                }
              ]
            }
          ],
          "package": {
            "name": "gitea",
            "purl": "pkg:bitnami/gitea",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/gitea/BIT-gitea-2026-96399.json"
          }
        }
      ],
      "modified": "2026-10-14T11:10:50.833709004Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-28.0.0/",
        "https://github.com/go-gitea/gitea/pull/39354",
        "https://github.com/go-gitea/gitea/releases/tag/v28.0.0",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-mw6q-qj47-9g5q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-96399"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-96399",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 316237,
  "published_at": "2026-10-14T08:43:11.018+00:00"
}