Denial of Service in GitLab GraphQL API
CVE-2025-12664 is a denial-of-service vulnerability in the GitLab CE/EE GraphQL API affecting self-managed installations. It impacts all versions from 13.0 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3. The issue stems from improper validation of the quantity of unauthenticated GraphQL requests to the /api/graphql endpoint, classified as CWE-1284. An attacker can repeatedly send GraphQL queries over HTTP without authentication and overwhelm backend resources. Available reporting indicates the flaw is volumetric in nature rather than a single-query complexity issue; existing GraphQL complexity scoring and per-request timeout controls did not prevent exploitation. Successful abuse can consume CPU, memory, and Sidekiq worker capacity, degrading or interrupting service.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in GitLab's GraphQL API that can be triggered through repeated queries.
A high-severity GitLab denial-of-service vulnerability that allows unauthenticated attackers to overwhelm the server with repeated GraphQL queries.
A denial-of-service vulnerability in the GitLab CE/EE GraphQL API that could allow unauthenticated attackers to cause service disruption via repeated GraphQL queries.
An unauthenticated volumetric denial-of-service vulnerability in GitLab's GraphQL API caused by improper input quantity validation, allowing repeated GraphQL requests to exhaust resources on self-managed GitLab CE and EE instances.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.