Gitea prior to 1.27.0 SSRF via Migration URI Fetch Bypass

{
  "id": "c0e504e4ae78bb187a1e40bab8a6631c32c2ca0b76e9b996a31b6b8d6cc4a2c0",
  "url": "https://osv.dev/vulnerability/BIT-gitea-2026-34966",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Gitea prior to 1.27.0 SSRF via Migration URI Fetch Bypass",
    "summary": "Gitea prior to 1.27.0 contains a server-side request forgery vulnerability that allows authenticated attackers to bypass SSRF protections by exploiting HTTP fetch operations in migration and OAuth avatar code paths that use Go's default http.Get without a custom DialContext. Attackers can supply arbitrary URLs through release asset download URLs, pull-request patch URLs, or OAuth avatar endpoints to reach internal services, cloud instance-metadata endpoints, or read local files such as the application configuration containing database credentials and signing secrets, with exfiltrated content persisted as migration release assets for later retrieval.",
    "evidence": "osv:BIT-gitea-2026-34966",
    "products": [
      {
        "name": {
          "value": "gitea",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.27.0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-gitea-2026-34966",
      "aliases": [
        "BIT-gitea-2026-34966",
        "CVE-2026-34966",
        "CVE-2026-59765",
        "GHSA-2wm4-vwp6-v7xc",
        "GO-2026-6039"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.27.0"
                }
              ]
            }
          ],
          "package": {
            "name": "gitea",
            "purl": "pkg:bitnami/gitea",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/gitea/BIT-gitea-2026-34966.json"
          }
        }
      ],
      "modified": "2026-10-14T11:11:12.586131494Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-gitea/gitea",
        "https://github.com/go-gitea/gitea/commit/b969123b7fac51c88daab5cb64e5b2f4abd53288",
        "https://github.com/go-gitea/gitea/security/advisories/GHSA-2wm4-vwp6-v7xc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34966",
        "https://www.vulncheck.com/advisories/gitea-prior-to-ssrf-via-migration-uri-fetch-bypass"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:gitea:gitea:*:*:*:*:*:go:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34966",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-59765",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 316253,
  "published_at": "2026-10-14T08:42:57.193+00:00"
}