CVE-2023-6489Network attack vector

Authenticated service degradation via chat integration regex

Published Apr 12, 2024 · Updated Aug 14, 2026

Denial of service in GitLab CE/EE allows remote authenticated users to degrade an instance through the chat integration feature. The chat integration path evaluates attacker-controlled input with an inefficient regular expression, causing excessive resource consumption; GitLab has not published the affected expression or function. Affected releases are 16.7.7 through 16.8.5, 16.9 through 16.9.3, and 16.10 through 16.10.1; a valid low-privilege account is required, and the bounded impact is service degradation.

CVSS severity4.3
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GitLab CE/EE allows remote authenticated users to degrade an instance through the chat integration feature. The chat integration path evaluates attacker-controlled input with an inefficient regular expression, causing excessive resource consumption; GitLab has not published the affected expression or function. Affected releases are 16.7.7 through 16.8.5, 16.9 through 16.9.3, and 16.10 through 16.10.1; a valid low-privilege account is required, and the bounded impact is service degradation.

The record

CVE
CVE-2023-6489
Published
Apr 12, 2024
Updated
Aug 14, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-1333, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=16.10 <16.10.2
  2. Affected versionversion=16.7.7 <16.8.6
  3. Affected versionversion=16.9 <16.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=16.10 <16.10.2; version=16.7.7 <16.8.6; version=16.9 <16.9.4

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.3GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

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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