CVE-2025-12571Network attack vector

Service interruption via unbounded JSON resource allocation

Published Nov 26, 2025 · Updated Dec 10, 2025

Denial of service in GitLab CE/EE allows remote attackers to interrupt service through requests containing malicious JSON payloads. The JSON input validation middleware allocates resources for attacker-controlled payloads without enforcing limits or throttling. Affected releases are 17.10 through 18.4.4, 18.5 through 18.5.2, and 18.6.0; no authentication or user interaction is required.

CVSS severity7.5
High
EPSS probability0.51%
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 attackers to interrupt service through requests containing malicious JSON payloads. The JSON input validation middleware allocates resources for attacker-controlled payloads without enforcing limits or throttling. Affected releases are 17.10 through 18.4.4, 18.5 through 18.5.2, and 18.6.0; no authentication or user interaction is required.

The record

CVE
CVE-2025-12571
Published
Nov 26, 2025
Updated
Dec 10, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 10, 2025Record 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=17.10 <18.4.5
  2. Affected versionversion=18.5 <18.5.3
  3. Affected versionversion=18.6 <18.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=17.10 <18.4.5; version=18.5 <18.5.3; version=18.6 <18.6.1

Published CVSS scores

7.5GitLabCVSS: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application 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

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Your stack

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