CVE-2025-13690Network attack vectorHinoki check available

Authenticated service interruption via malformed webhook headers

Published Mar 11, 2026 · Updated Mar 11, 2026

Resource exhaustion in GitLab CE/EE allows remote authenticated users to interrupt service via crafted webhook custom header names. The webhook custom-header validator accepts malformed names that drive unbounded resource allocation; GitLab has not disclosed the responsible function or resource. A valid account is required, and the documented effect is availability loss only; the vendor has not disclosed whether the service hangs or crashes.

CVSS severity6.5
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource exhaustion in GitLab CE/EE allows remote authenticated users to interrupt service via crafted webhook custom header names. The webhook custom-header validator accepts malformed names that drive unbounded resource allocation; GitLab has not disclosed the responsible function or resource. A valid account is required, and the documented effect is availability loss only; the vendor has not disclosed whether the service hangs or crashes.

The record

CVE
CVE-2025-13690
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.11 <18.7.6
  2. Affected versionversion=18.8 <18.8.6
  3. Affected versionversion=18.9 <18.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=16.11 <18.7.6; version=18.8 <18.8.6; version=18.9 <18.9.2

Published CVSS scores

6.5GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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