{"id":"CVE-2026-1388","state":"PUBLISHED","title":"Inefficient Regular Expression Complexity in GitLab","description":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.","publishedAt":"2026-02-25T20:05:05.289Z","updatedAt":"2026-02-26T15:07:56.004Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitLab"},"assigner":"GitLab","products":["GitLab GitLab"],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"9.2","status":"affected","lessThan":"18.7.5","versionType":"semver"},{"version":"18.8","status":"affected","lessThan":"18.8.5","versionType":"semver"},{"version":"18.9","status":"affected","lessThan":"18.9.1","versionType":"semver"}],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git","cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"]}],"references":["https://gitlab.com/gitlab-org/gitlab/-/issues/587560","https://hackerone.com/reports/3482893","https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/"],"weaknesses":["CWE-1333"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/1xxx/CVE-2026-1388.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-1388","state":"PUBLISHED","datePublished":"2026-02-25T20:05:05.289Z","dateUpdated":"2026-02-26T15:07:56.004Z","assignerShortName":"GitLab","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateReserved":"2026-01-23T20:33:20.246Z"},"containers":{"cna":{"title":"Inefficient Regular Expression Complexity in GitLab","descriptions":[{"lang":"en","value":"GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions."}],"affected":[{"vendor":"GitLab","product":"GitLab","defaultStatus":"unaffected","versions":[{"version":"9.2","status":"affected","lessThan":"18.7.5","versionType":"semver"},{"version":"18.8","status":"affected","lessThan":"18.8.5","versionType":"semver"},{"version":"18.9","status":"affected","lessThan":"18.9.1","versionType":"semver"}],"repo":"git://git@gitlab.com:gitlab-org/gitlab.git","cpes":["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"]}],"references":[{"url":"https://gitlab.com/gitlab-org/gitlab/-/issues/587560","name":"GitLab Issue #587560","tags":["issue-tracking","permissions-required"]},{"url":"https://hackerone.com/reports/3482893","name":"HackerOne Bug Bounty Report #3482893","tags":["technical-description","exploit","permissions-required"]},{"url":"https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitLab","orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateUpdated":"2026-02-25T20:05:05.289Z"},"solutions":[{"lang":"en","value":"Upgrade to versions 18.7.5, 18.8.5, 18.9.1 or above."}],"credits":[{"lang":"en","value":"Thanks [sim4n6](https://hackerone.com/sim4n6) for reporting this vulnerability through our HackerOne bug bounty program","type":"finder"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-26T15:07:20.663791Z","id":"CVE-2026-1388","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-26T15:07:56.004Z"}}]}}}