Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
API is network-reachable with no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is availability-only via worker exhaustion (C:N/I:N/A:H), scope unchanged.
Primary rating from Vendor (GitLab).
CVSS VectorVendor: GitLab
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 12.10 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an unauthenticated user to cause denial of service due to improper input validation in the API request parsing middleware.
Articles & Coverage 2
AnalysisAI
Denial of service in GitLab CE/EE versions 12.10 through 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 allows unauthenticated remote attackers to crash or degrade the API request parsing middleware via malformed input. Publicly available exploit code exists (HackerOne report 3671995), and the CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/A:H) reflects trivially-reachable, no-auth exploitation against any internet-exposed GitLab instance. No CISA KEV listing at time of analysis.
Technical ContextAI
GitLab is a self-hosted and SaaS DevOps platform built on Ruby on Rails. The flaw lives in the API request parsing middleware - the Rack/Grape layer that deserializes incoming HTTP API requests before they reach controller logic. CWE-770 (Allocation of Resources Without Limits or Throttling) indicates the middleware accepts attacker-controlled input that triggers unbounded resource consumption (memory, CPU, or worker threads) because size/complexity limits are not enforced prior to parsing. Affected CPE is cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:* covering both Community and Enterprise editions across the listed branches.
RemediationAI
Vendor-released patches: upgrade to GitLab 18.10.8, 18.11.5, or 19.0.2 (or later) as described in the June 10, 2026 patch release notes at https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/. Self-managed operators on long-unsupported versions in the 12.10-17.x range should plan an upgrade path to a current supported branch rather than backporting. As compensating controls until patching is possible, restrict API exposure by placing GitLab behind an authenticating reverse proxy or VPN (trade-off: breaks public API integrations and CI runners reaching from the internet), enable request-size limits and aggressive rate-limiting on /api/* at the upstream proxy (trade-off: may reject legitimate large GraphQL queries or repo uploads), and monitor Puma/Workhorse worker memory and crash rates for anomalous spikes. GitLab.com SaaS tenants require no action.
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Same technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-36227
GHSA-cx4g-hr74-m89m