CVE-2026-1458Public exploitNetwork attack vector

Service interruption via quadratic Markdown path processing

Published Feb 11, 2026 · Updated Feb 11, 2026

Resource exhaustion in affected GitLab CE/EE releases allows remote authenticated users to interrupt service via crafted Markdown files. RepositoryLinkFilter's build_relative_path repeatedly removes each ../ prefix by shifting the remaining path, causing quadratic CPU work on files containing many prefixes. A low-privileged user must first place the file in a public project; a small number of unauthenticated preview requests can then make the instance unresponsive.

CVSS severity6.5
Medium
EPSS probability0.38%
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 affected GitLab CE/EE releases allows remote authenticated users to interrupt service via crafted Markdown files. RepositoryLinkFilter's build_relative_path repeatedly removes each ../ prefix by shifting the remaining path, causing quadratic CPU work on files containing many prefixes. A low-privileged user must first place the file in a public project; a small number of unauthenticated preview requests can then make the instance unresponsive.

The record

CVE
CVE-2026-1458
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-434, CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 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=18.7 <18.7.4
  2. Affected versionversion=18.8 <18.8.4
  3. Affected versionversion=8.0 <18.6.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=18.7 <18.7.4; version=18.8 <18.8.4; version=8.0 <18.6.6

Published CVSS scores

6.5GitLabCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS: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 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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

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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