Deserialization of Untrusted Data in GitLab

{
  "id": "8755f6f10c8096b452c9436c66b53939bc1c3063dfdb9a3e37814ef2049f314c",
  "url": "https://osv.dev/vulnerability/CVE-2026-1184",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Deserialization of Untrusted Data in GitLab",
    "summary": "GitLab has remediated an issue in GitLab EE affecting all versions from 11.9 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by uploading a specially crafted file due to improper validation.",
    "evidence": "osv:CVE-2026-1184",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-1184",
      "aliases": [
        "BIT-gitlab-2026-1184",
        "CVE-2026-1184"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/gitlab-org/gitlab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2f3536bdda88ae962d4f67ced68af6efd82254f1"
                },
                {
                  "fixed": "d2242c5752a152db3c281d8a9d1e7f248e1654a9"
                },
                {
                  "introduced": "57c08314af5bc8f317b1967330f92ed029e2c628"
                },
                {
                  "fixed": "f80804c4e73fb0404af24e88ffb5246c0aeeda40"
                },
                {
                  "introduced": "1060c7b0ff78be7c8abe8fd6d23dcb1ca493fd78"
                },
                {
                  "fixed": "daa4145c8330213081c57260b569539e3b157b87"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "11.9.0"
                      },
                      {
                        "fixed": "18.9.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "18.10.0"
                      },
                      {
                        "fixed": "18.10.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "18.11.0"
                      },
                      {
                        "fixed": "18.11.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v18.10.5-ee",
            "v18.11.2-ee",
            "v18.11.0-ee",
            "v18.10.2-ee",
            "v18.10.0-ee"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1184.json"
          }
        }
      ],
      "modified": "2026-10-30T10:30:38.813812112Z",
      "provider": "osv",
      "references": [
        "https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/",
        "https://gitlab.com/gitlab-org/gitlab/-/work_items/586634",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1184.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-1184",
        "https://hackerone.com/reports/3515842"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-502"
        ],
        "cna_assigner": "GitLab",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "11.9"
                  },
                  {
                    "fixed": "18.9.7"
                  },
                  {
                    "introduced": "18.10"
                  },
                  {
                    "fixed": "18.10.6"
                  },
                  {
                    "introduced": "18.11"
                  },
                  {
                    "fixed": "18.11.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "11.9"
                  },
                  {
                    "fixed": "18.9.7"
                  },
                  {
                    "introduced": "18.10"
                  },
                  {
                    "fixed": "18.10.6"
                  },
                  {
                    "introduced": "18.11"
                  },
                  {
                    "fixed": "18.11.3"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1184.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-1184",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514279,
  "published_at": "2026-05-14T05:37:02.391+00:00"
}