{"id":"CVE-2026-12635","summary":"Reliance on Reverse DNS Resolution for a Security-Critical Action in GitLab","details":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 8.3 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with maintainer-role permissions to make requests to internal network resources through mirror synchronization due to improper URL validation.","aliases":["BIT-gitlab-2026-12635"],"modified":"2026-08-27T11:30:31.395056979Z","published":"2026-06-25T04:33:34.156Z","database_specific":{"cna_assigner":"GitLab","cwe_ids":["CWE-350"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12635.json","unresolved_ranges":[{"extracted_events":[{"introduced":"8.3"},{"fixed":"18.11.6"},{"introduced":"19.0"},{"fixed":"19.0.3"},{"introduced":"19.1"},{"fixed":"19.1.1"}],"source":"AFFECTED_FIELD"},{"source":"DESCRIPTION","extracted_events":[{"introduced":"8.3"},{"fixed":"18.11.6"},{"introduced":"19.0"},{"fixed":"19.0.3"},{"introduced":"19.1"},{"fixed":"19.1.1"}]}]},"references":[{"type":"WEB","url":"https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-1-released/"},{"type":"WEB","url":"https://gitlab.com/gitlab-org/gitlab/-/work_items/594321"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12635.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12635"},{"type":"PACKAGE","url":"git://git@gitlab.com:gitlab-org/gitlab.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/gitlab-org/gitlab","events":[{"introduced":"a810cc509e54b71aff30dfb9ba52ea4aea587c32"},{"fixed":"0626dbe45d0ea9a431f494135ee4636d149eb523"},{"introduced":"f07e3c5b3c8128be5db112e5b2b618fe31ea1b35"},{"fixed":"e1892478cfb7980c694d13e0e5e15e129aa3d908"},{"introduced":"67581074a0aab1f53cdafe7eead5f5d07f3afec8"},{"last_affected":"67581074a0aab1f53cdafe7eead5f5d07f3afec8"}],"database_specific":{"extracted_events":[{"introduced":"8.3.0"},{"fixed":"18.11.6"},{"introduced":"19.0.0"},{"fixed":"19.0.3"},{"introduced":"19.1.0"},{"last_affected":"19.1.0"}],"source":["CPE_RANGE","CPE_STRING"],"cpe":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*","cpe:2.3:a:gitlab:gitlab:19.1.0:*:*:*:*:*:*:*"]}}],"versions":["19.1.0","v19.1.0-ee","v19.0.0-ee"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12635.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N"}]}