CVE-2024-5423Network attack vector

Service interruption via expanding Markdown payload

Published Aug 8, 2024 · Updated Aug 29, 2024

Resource exhaustion in GitLab CE/EE affected releases allows remote authenticated users to interrupt service through crafted Markdown. The Banzai Markdown pipeline applies filters that can expand attacker-controlled input without a sufficient complexity bound, driving CPU threads to 100%. Low-privileged authenticated access and a Markdown-rendering path are required; the documented impact is availability loss only.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in GitLab CE/EE affected releases allows remote authenticated users to interrupt service through crafted Markdown. The Banzai Markdown pipeline applies filters that can expand attacker-controlled input without a sufficient complexity bound, driving CPU threads to 100%. Low-privileged authenticated access and a Markdown-rendering path are required; the documented impact is availability loss only.

The record

CVE
CVE-2024-5423
Published
Aug 8, 2024
Updated
Aug 29, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2024Record 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=1 <17.0.6
  2. Affected versionversion=17.1 <17.1.4
  3. Affected versionversion=17.2 <17.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=1 <17.0.6; version=17.1 <17.1.4; version=17.2 <17.2.2

Published CVSS scores

6.5GitLabCVSS: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-400Uncontrolled Resource Consumption
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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