{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "code.gitea.io/gitea"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.27.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58441"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T20:37:29Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nGitea\u0027s `restore-repo` CLI command restores a repository from a dump\ndirectory/archive. When parsing `pull_request.yml` from that dump, the\n`Head.CloneURL` field is used to add a git remote and fetch from it with\nno validation, because the safety check that\u0027s supposed to guard it\n(`CheckAndEnsureSafePR`) is called with an empty `commonCloneBaseURL`,\nwhich silently disables it. This lets a malicious dump make the Gitea\nserver execute `git fetch` against an attacker-chosen URL (SSRF), or\ndisclose a local git repository via `file://`. This is a different root\ncause from the recently fixed path-traversal issue in the same command\n(#38215), which patched `DownloadURL`/`PatchURL` but not `Head.CloneURL`.\n\n### Details\n`services/migrations/restore.go`\u0027s `GetPullRequests()` unmarshals\n`pull_request.yml` directly into `base.PullRequest` structs with no\nvalidation of `Head.CloneURL`:\n\n```go\nerr = yaml.Unmarshal(bs, \u0026pulls)\n...\nfor _, pr := range pulls {\n    if pr.PatchURL != \"\" {\n        pr.PatchURL = \"file://\" + util.FilePathJoinAbs(r.baseDir, pr.PatchURL)\n    }\n    CheckAndEnsureSafePR(pr, \"\", r)   // \u003c-- empty baseURL\n}\n```\n\n`CheckAndEnsureSafePR` (`services/migrations/common.go`) is supposed to\nreject `Head.CloneURL`/`PatchURL` values that don\u0027t share a common base\nURL:\n\n```go\nfunc hasBaseURL(toCheck, baseURL string) bool {\n    if len(baseURL) \u003e 0 \u0026\u0026 baseURL[len(baseURL)-1] != \u0027/\u0027 {\n        baseURL += \"/\"\n    }\n    return strings.HasPrefix(toCheck, baseURL)\n}\n\nfunc CheckAndEnsureSafePR(pr *base.PullRequest, commonCloneBaseURL string, g base.Downloader) bool {\n    valid := true\n    if pr.PatchURL != \"\" \u0026\u0026 !hasBaseURL(pr.PatchURL, commonCloneBaseURL) {\n        pr.PatchURL = \"\"\n        valid = false\n    }\n    if pr.Head.CloneURL != \"\" \u0026\u0026 !hasBaseURL(pr.Head.CloneURL, commonCloneBaseURL) {\n        pr.Head.CloneURL = \"\"\n        valid = false\n    }\n    return valid\n}\n```\n\n`strings.HasPrefix(anything, \"\")` is always `true` in Go. Because\n`restore.go` is the only caller that passes `\"\"` as\n`commonCloneBaseURL`, this check is a complete no-op on the restore-repo\npath \u2014 `Head.CloneURL` survives unchanged regardless of its value. Every\nother downloader (`github.go`, `gitlab.go`, `gitea_downloader.go`,\n`codebase.go`, `codecommit.go`, `onedev.go`) passes a real base URL, so\nthey are not affected.\n\n`services/migrations/gitea_uploader.go` then uses the unvalidated value\ndirectly:\n\n```go\nerr := g.gitRepo.AddRemote(remote, pr.Head.CloneURL, true)\n// ... later: fetch from that remote\n```\n\nresulting in the server executing `git fetch` against an\nattacker-controlled URL sourced from the dump file.\n\n**RCE via git\u0027s `ext::` transport helper was tested and ruled out** \u2014 a\nnormal `git` install rejects it by default (`fatal: transport \u0027ext\u0027 not\nallowed`), independent of Gitea\u0027s own configuration. This report is\nscoped to SSRF and local git-repository disclosure.\n\nConfirmed present, byte-for-byte identical, in `v1.26.4` (latest stable\ntag), `release/v1.27`, and `main`, by direct checkout and diff.\n\n### PoC\n1. Create a dump directory following the normal `restore-repo` layout\n   (`repo.yml`, etc.), and add a `pull_request.yml` containing at least\n   one entry with:\n```yaml\n   - number: 1\n     head:\n       cloneURL: \"http://\u003cattacker-controlled-or-internal-host\u003e:\u003cport\u003e/ssrf-proof\"\n       ref: \"main\"\n```\n2. Run `gitea restore-repo` against that dump directory for any repo\n   owner.\n3. Observe on the target host/listener: an actual `git` HTTP\n   discovery request arrives, e.g.\n   `GET /ssrf-proof/info/refs?service=git-upload-pack`, driven entirely\n   by the value from the dump file.\n\nVerified the core mechanism (steps 2\u20133, i.e. the unvalidated\n`Head.CloneURL` surviving `CheckAndEnsureSafePR(\"\")` and then being used\nin a real `git remote add` + `git fetch`) with a minimal, standalone Go\nprogram built from the **verbatim, unmodified** `hasBaseURL` /\n`CheckAndEnsureSafePR` function bodies (attached: `gitea_ssrf_poc.go`),\nrun end-to-end against a local HTTP listener. The listener\u0027s access log\nconfirms the request actually arrives. \n\n### Impact\nAn attacker who can get an administrator to run `gitea restore-repo`\nagainst a malicious dump (the same threat model already accepted for the\njust-fixed path-traversal issue in this command, #38215) can make the\nGitea server issue a `git fetch` against an arbitrary attacker-chosen\nURL. This allows:\n- SSRF against internal-only services or cloud metadata endpoints\n  reachable from the Gitea host.\n- Disclosure of local git repositories reachable via `file://` paths\n  readable by the Gitea process.\n\nNo public disclosure planned. Happy to provide further detail on\nrequest.",
  "id": "GHSA-xmj7-xj85-hfc3",
  "modified": "2026-07-21T20:37:29Z",
  "published": "2026-07-21T20:37:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-xmj7-xj85-hfc3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-gitea/gitea"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Gitea: SSRF in restore-repo via unsanitized pull_request.yml Head.CloneURL"
}