CVE-2023-6386Network attack vector

Service degradation via pipeline syntax ReDoS

Published Feb 5, 2025 · Updated Feb 5, 2025

Regular expression denial of service in GitLab CE/EE allows remote authenticated users to degrade an affected instance through pipeline syntax validation. The CI/CD Pipeline Editor's syntax verification applies an inefficient regular expression to attacker-controlled pipeline input, consuming excessive resources. A low-privileged account with editor access is sufficient; affected releases are 15.11 through 16.6.6, 16.7.0 through 16.7.4, and 16.8.0 through 16.8.1, and exploitation degrades service without reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Regular expression denial of service in GitLab CE/EE allows remote authenticated users to degrade an affected instance through pipeline syntax validation. The CI/CD Pipeline Editor's syntax verification applies an inefficient regular expression to attacker-controlled pipeline input, consuming excessive resources. A low-privileged account with editor access is sufficient; affected releases are 15.11 through 16.6.6, 16.7.0 through 16.7.4, and 16.8.0 through 16.8.1, and exploitation degrades service without reported data disclosure or modification.

The record

CVE
CVE-2023-6386
Published
Feb 5, 2025
Updated
Feb 5, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=15.11 <16.6.7
  2. Affected versionversion=16.7 <16.7.5
  3. Affected versionversion=16.8 <16.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=15.11 <16.6.7; version=16.7 <16.7.5; version=16.8 <16.8.2

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
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo