Gitea migration SSRF through ALLOWED_DOMAINS address check bypass

{
  "id": "db8cdf4da8072d21e3a428c672297286d5083296ebf33452f1cd3f349060ee60",
  "url": "https://osv.dev/vulnerability/BIT-gitea-2026-101027",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea migration SSRF through ALLOWED_DOMAINS address check bypass",
    "summary": "When `[migrations] ALLOWED_DOMAINS` was configured, a hostname matching the allow list was accepted without checking its resolved address against the local-network restrictions. A user who can start repository migrations and control the DNS of an allowed hostname could make it resolve to loopback or private addresses and bypass `ALLOW_LOCALNETWORKS = false`, reaching internal services from the Gitea server. Instances without `ALLOWED_DOMAINS` configured are not affected by this specific bypass.",
    "evidence": "osv:BIT-gitea-2026-101027",
    "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-2026-101027",
      "aliases": [
        "BIT-gitea-2026-101027",
        "CVE-2026-101027",
        "GHSA-fqjr-23c8-gg9m"
      ],
      "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:L/UI:N/S:C/C:H/I:N/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/gitea/BIT-gitea-2026-101027.json"
          }
        }
      ],
      "modified": "2026-10-16T09:55:54.250189082Z",
      "provider": "osv",
      "references": [
        "https://blog.gitea.com/release-of-28.0.0/",
        "https://github.com/go-gitea/gitea/pull/39426",
        "https://github.com/go-gitea/gitea/releases/tag/v28.0.0",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-fqjr-23c8-gg9m",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-101027"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-101027",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 338724,
  "published_at": "2026-10-16T08:36:27.105+00:00"
}