GitLab Community Edition/Enterprise Edition up to 18.7.5/18.8.5/18.9.1 Webhook Custom Header Name allocation of resources

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in GitLab Community Edition and Enterprise Edition up to 18.7.5/18.8.5/18.9.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Webhook Custom Header Name Handler. Such manipulation leads to allocation of resources. This vulnerability is listed as CVE-2025-13690. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in GitLab Community Edition and Enterprise Edition up to 18.7.5/18.8.5/18.9.1 and classified as problematic. Affected by this issue is an unknown code of the component Webhook Custom Header Name Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.11 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause a denial of service condition due to improper input validation on webhook custom header names under certain conditions.

The weakness was presented by Sim4N6. The advisory is available at hackerone.com. This vulnerability is handled as CVE-2025-13690 since 11/25/2025. The exploitation is known to be easy. The attack may be launched remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 18.7.6, 18.8.6 or 18.9.2 eliminates this vulnerability. The upgrade is hosted for download at about.gitlab.com.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitLab): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Community Edition/Enterprise Edition 18.7.6/18.8.6/18.9.2

Timelineinfo

11/25/2025 CVE reserved
03/11/2026 +106 days Advisory disclosed
03/11/2026 +0 days VulDB entry created
03/14/2026 +3 days VulDB entry last update

Sourcesinfo

Vendor: gitlab.com

Advisory: hackerone.com
Researcher: Sim4N6
Status: Confirmed

CVE: CVE-2025-13690 (🔒)
GCVE (CVE): GCVE-0-2025-13690
GCVE (VulDB): GCVE-100-350438

Entryinfo

Created: 03/11/2026 17:32
Updated: 03/14/2026 07:36
Changes: 03/11/2026 17:32 (66), 03/14/2026 07:36 (1)
Complete: 🔍
Cache ID: 216::103

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