CVE-2026-3988

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3988", "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a", "state": "PUBLISHED", "assignerShortName": "GitLab", "dateReserved": "2026-03-11T15:37:07.048Z", "datePublished": "2026-03-25T16:33:43.952Z", "dateUpdated": "2026-03-25T17:21:53.191Z"}, "containers": {"cna": {"title": "Inefficient Algorithmic Complexity in GitLab", "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing."}], "affected": [{"vendor": "GitLab", "product": "GitLab", "repo": "git://git@gitlab.com:gitlab-org/gitlab.git", "cpes": ["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"], "versions": [{"version": "18.5", "status": "affected", "lessThan": "18.8.7", "versionType": "semver"}, {"version": "18.9", "status": "affected", "lessThan": "18.9.3", "versionType": "semver"}, {"version": "18.10", "status": "affected", "lessThan": "18.10.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "cweId": "CWE-407", "type": "CWE"}]}], "references": [{"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/593140"}, {"url": "https://hackerone.com/reports/3597342", "name": "HackerOne Bug Bounty Report #3597342", "tags": ["technical-description", "exploit", "permissions-required"]}, {"url": "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-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"}}], "solutions": [{"lang": "en", "value": "Upgrade to versions 18.8.7, 18.9.3, 18.10.1 or above."}], "credits": [{"lang": "en", "value": "Thanks [svalkanov](https://hackerone.com/svalkanov) for reporting this vulnerability through our HackerOne bug bounty program", "type": "finder"}], "providerMetadata": {"orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a", "shortName": "GitLab", "dateUpdated": "2026-03-25T16:33:43.952Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-25T17:21:45.431064Z", "id": "CVE-2026-3988", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-25T17:21:53.191Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-3988", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-25T17:21:45.431064Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-25T17:21:50.667Z"}}], "cna": {"title": "Inefficient Algorithmic Complexity in GitLab", "credits": [{"lang": "en", "type": "finder", "value": "Thanks [svalkanov](https://hackerone.com/svalkanov) for reporting this vulnerability through our HackerOne bug bounty program"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"], "repo": "git://git@gitlab.com:gitlab-org/gitlab.git", "vendor": "GitLab", "product": "GitLab", "versions": [{"status": "affected", "version": "18.5", "lessThan": "18.8.7", "versionType": "semver"}, {"status": "affected", "version": "18.9", "lessThan": "18.9.3", "versionType": "semver"}, {"status": "affected", "version": "18.10", "lessThan": "18.10.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Upgrade to versions 18.8.7, 18.9.3, 18.10.1 or above."}], "references": [{"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/593140"}, {"url": "https://hackerone.com/reports/3597342", "name": "HackerOne Bug Bounty Report #3597342", "tags": ["technical-description", "exploit", "permissions-required"]}, {"url": "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/"}], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-407", "description": "CWE-407: Inefficient Algorithmic Complexity"}]}], "providerMetadata": {"orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a", "shortName": "GitLab", "dateUpdated": "2026-03-25T16:33:43.952Z"}}}, "cveMetadata": {"cveId": "CVE-2026-3988", "state": "PUBLISHED", "dateUpdated": "2026-03-25T17:21:53.191Z", "dateReserved": "2026-03-11T15:37:07.048Z", "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a", "datePublished": "2026-03-25T16:33:43.952Z", "assignerShortName": "GitLab"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "product": "GitLab", "repo": "git://git@gitlab.com:gitlab-org/gitlab.git", "vendor": "GitLab", "versions": [{"lessThan": "18.8.7", "status": "affected", "version": "18.5", "versionType": "semver"}, {"lessThan": "18.9.3", "status": "affected", "version": "18.9", "versionType": "semver"}, {"lessThan": "18.10.1", "status": "affected", "version": "18.10", "versionType": "semver"}]}], "source": "cve@gitlab.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*", "matchCriteriaId": "991041A7-46AA-49CE-9AA0-D2BF561C4713", "versionEndExcluding": "18.8.7", "versionStartIncluding": "18.5.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*", "matchCriteriaId": "91B89AFE-E378-447B-99AB-627A8BE12907", "versionEndExcluding": "18.8.7", "versionStartIncluding": "18.5.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*", "matchCriteriaId": "96F7E7EC-4C2E-4A48-8134-9262B251C89C", "versionEndExcluding": "18.9.3", "versionStartIncluding": "18.9.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*", "matchCriteriaId": "C3240349-67A3-43E2-BAD9-EFAA3E0A5D31", "versionEndExcluding": "18.9.3", "versionStartIncluding": "18.9.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:community:*:*:*", "matchCriteriaId": "D5B6ECC9-6AEA-4DD0-B12B-A3A7A9FE91DA", "vulnerable": true}, {"criteria": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:enterprise:*:*:*", "matchCriteriaId": "2B8DF779-B99E-4096-B734-78AB1849D136", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing."}, {"lang": "es", "value": "GitLab ha remediado un problema en GitLab CE/EE que afectaba a todas las versiones desde la 18.5 antes de la 18.8.7, la 18.9 antes de la 18.9.3 y la 18.10 antes de la 18.10.1 que podr\u00eda haber permitido a un usuario no autenticado causar una denegaci\u00f3n de servicio al hacer que la instancia de GitLab no respondiera debido a una validaci\u00f3n de entrada incorrecta en el procesamiento de solicitudes GraphQL."}], "id": "CVE-2026-3988", "lastModified": "2026-06-17T10:44:34.603", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "cve@gitlab.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3988", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-25T17:21:45.431064Z", "version": "2.0.3"}}]}, "published": "2026-03-25T17:17:09.553", "references": [{"source": "cve@gitlab.com", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/"}, {"source": "cve@gitlab.com", "tags": ["Broken Link"], "url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/593140"}, {"source": "cve@gitlab.com", "tags": ["Permissions Required"], "url": "https://hackerone.com/reports/3597342"}], "sourceIdentifier": "cve@gitlab.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "cve@gitlab.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[18.5,18.8.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[18.9,18.9.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[18.10,18.10.1)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "gitlab", "vendor": "gitlab"}], "analysis": {"en": {"generated_at": "2026-03-26T18:56:21.185844+00:00", "value": {"mitigation_remediation": ["Upgrade GitLab to version 18.8.7, 18.9.3, or 18.10.1 or newer", "If upgrading is not immediately possible, block unauthenticated access to the GraphQL endpoint to prevent exploitation", "Verify your installed GitLab version is not within the vulnerable range before making changes", "Monitor logs and traffic for abnormal GraphQL activity that may indicate attempted exploitation"], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "This vulnerability is present in GitLab Community Edition and Enterprise Edition from version 18.5 through just before the patched releases of 18.8.7, 18.9.3, and 18.10.1. Both the community and enterprise variants of each affected version are susceptible, while any release equal to or newer than the mentioned patch numbers is considered safe.", "description_and_impact": "GitLab includes an inefficient algorithmic flaw in its GraphQL request processing that weakens the system\u2019s ability to handle malformed or overly complex queries. An unauthenticated attacker can exploit this by crafting a specialized GraphQL payload that forces the server to perform excessive computation, ultimately exhausting resources and rendering the instance unresponsive. The weakness is a classic example of a poor algorithmic complexity problem (CWE\u2011407) and directly impacts availability.", "risk_and_exploitability": "The CVSS score of 7.5 classifies the flaw as high severity, yet the EPSS score of less than 1% and its absence from the CISA KEV catalog suggest limited current exploitation. The likely attack vector is over the public GraphQL endpoint; an attacker does not need authentication or special permissions, simply sending crafted queries that trigger the algorithmic inefficiency and cause service disruption."}}}}, "created": "2026-03-25T21:46:55.229946+00:00", "updated": "2026-03-27T09:30:29.491270+00:00", "vendors": ["gitlab", "gitlab$PRODUCT$gitlab"]}