{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "code.gitea.io/gitea"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.27.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55984"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T20:59:14Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nThe AddTime API handler continues execution after an error returned by `GetUserByName()`.\n\nWhen a repository administrator specifies a non-existent user name, an error response is generated but execution does not stop. Subsequent code dereferences a nil user pointer, resulting in a runtime panic.\n\n### Details\n\nAffected endpoint:\n\n```http\nPOST /api/v1/repos/{owner}/{repo}/issues/{index}/times\n```\n\nAffected file:\n\n```text\nrouters/api/v1/repo/issue_tracked_time.go\n```\n\nRelevant code:\n\n```go\nuser, err = user_model.GetUserByName(ctx, form.User)\nif err != nil {\n    ctx.APIErrorInternal(err)\n    // missing return\n}\n```\n\nExecution continues to:\n\n```go\ntrackedTime, err := issues_model.AddTime(\n    ctx,\n    user,\n    issue,\n    form.Time,\n    created,\n)\n```\n\nWhen `GetUserByName()` fails, `user` is nil.\n\nThe subsequent call dereferences the nil pointer and triggers a runtime panic.\n\n### Proof of Concept\n\nUsing a repository administrator account:\n\n```http\nPOST /api/v1/repos/owner/repo/issues/1/times\nContent-Type: application/json\n\n{\n  \"time\": 3600,\n  \"user_name\": \"nonexistent_user_xyz\"\n}\n```\n\nResult:\n\n```text\nHTTP 500\nruntime error: invalid memory address or nil pointer dereference\n```\n\nThe stack trace indicates execution reaches the AddTime code path with a nil user object.\n\n### Impact\n\nAn authenticated repository administrator can repeatedly trigger server-side panics through the affected endpoint.\n\nDepending on deployment configuration and panic recovery behavior, this may result in request failures, stack trace disclosure, excessive log generation, or degraded service availability.\n\n### Suggested Fix\n\nAdd a return statement after the error response:\n\n```go\nuser, err = user_model.GetUserByName(ctx, form.User)\nif err != nil {\n    ctx.APIErrorInternal(err)\n    return\n}\n```",
  "id": "GHSA-m932-crvm-gcp5",
  "modified": "2026-07-21T20:59:14Z",
  "published": "2026-07-21T20:59:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-m932-crvm-gcp5"
    },
    {
      "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:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Gitea: Null Pointer Dereference in AddTime API Causes Authenticated Denial of Service"
}