High
Inefficient Algorithmic Complexity in GitLab
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-3988
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 02:49 UTC · Revision 1
Source evidence
Inefficient Algorithmic Complexity in GitLab
core-osv · Original sourcePublished 25 Mar 2026, 16:33 UTC
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.
osv:CVE-2026-3988
Complete source record
{
"id": "9e7bca8b01f78c0851f00ed374c9dcf506ca5d7cb0ac0d27d3c250d4ee2052b7",
"url": "https://osv.dev/vulnerability/CVE-2026-3988",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Inefficient Algorithmic Complexity in GitLab",
"summary": "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.",
"evidence": "osv:CVE-2026-3988",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-3988",
"aliases": [
"BIT-gitlab-2026-3988",
"CVE-2026-3988"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.com/gitlab-org/gitlab",
"type": "GIT",
"events": [
{
"introduced": "37cc4da7158316bb9b204cef9b056f16fff1df32"
},
{
"fixed": "bbb3a4b03698954b5a8efb0de7bafc061c303ed6"
},
{
"introduced": "20fe49b575fedd2b8cadc2c0640178879854aeb3"
},
{
"fixed": "d0161a9f097f49a9d33a4d8fe1d5a827ee777d67"
},
{
"introduced": "57c08314af5bc8f317b1967330f92ed029e2c628"
},
{
"last_affected": "57c08314af5bc8f317b1967330f92ed029e2c628"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"range": [
{
"introduced": "18.5.0"
},
{
"fixed": "18.8.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "18.5.0"
},
{
"fixed": "18.8.7"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"range": [
{
"introduced": "18.9.0"
},
{
"fixed": "18.9.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "18.9.0"
},
{
"fixed": "18.9.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:community:*:*:*",
"range": [
{
"introduced": "18.10.0"
},
{
"last_affected": "18.10.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:18.10.0:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "18.10.0"
},
{
"last_affected": "18.10.0"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"18.10.0",
"v18.9.0-ee",
"v18.10.0-ee"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3988.json"
}
}
],
"modified": "2026-10-30T10:30:54.086548725Z",
"provider": "osv",
"references": [
"https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/",
"https://gitlab.com/gitlab-org/gitlab/-/work_items/593140",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3988.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-3988",
"https://hackerone.com/reports/3597342"
],
"provider_metadata": {
"cwe_ids": [
"CWE-407"
],
"cna_assigner": "GitLab",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "18.5"
},
{
"fixed": "18.8.7"
},
{
"introduced": "18.9"
},
{
"fixed": "18.9.3"
},
{
"introduced": "18.10"
},
{
"fixed": "18.10.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "18.5"
},
{
"fixed": "18.8.7"
},
{
"introduced": "18.9"
},
{
"fixed": "18.9.3"
},
{
"introduced": "18.10"
},
{
"fixed": "18.10.1"
}
],
"source": "DESCRIPTION"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3988.json"
}
},
"related_cves": [
{
"value": "CVE-2026-3988",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492034,
"published_at": "2026-03-25T16:33:43.952+00:00"
}