---
id: CVE-2026-87721
title: >-
  Uncontrolled Resource Consumption (CWE-400 / CWE-407) in the ANTLR 3 search
  query parser (QueryParser / Query.g) in Gerrit Code Review versions 2.0.19
  through 3.12.9, 3.13.0 through 3.13.8, and 3.14.0 through 3.14.2 allows an
  unauthentic…
summary: >-
  Uncontrolled Resource Consumption (CWE-400 / CWE-407) in the ANTLR 3 search
  query parser (QueryParser / Query.g) in Gerrit Code Review versions 2.0.19
  through 3.12.9, 3.13.0 through 3.13.8, and 3.14.0 through 3.14.2 allows an
  unauthentic…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-400
  - CWE-407
  - CWE-834
vendor: Gerrit
product: Gerrit
affected:
  - Gerrit >= 2.0.19 < 3.12.10
  - Gerrit >= 3.13.0 < 3.13.9
  - Gerrit >= 3.14.0 < 3.14.3
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:17:17.107'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87721'
references:
  - url: 'https://issues.gerritcodereview.com/issues/541287630'
    label: cve-coordination@google.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-24T22:54:36.880Z'
epss: 0.00322
epssPercentile: 0.22549
---

## Overview

Uncontrolled Resource Consumption (CWE-400 / CWE-407) in the ANTLR 3 search query parser (QueryParser / Query.g) in Gerrit Code Review versions 2.0.19 through 3.12.9, 3.13.0 through 3.13.8, and 3.14.0 through 3.14.2 allows an unauthenticated remote attacker (or an authenticated user if anonymous read access is disabled) to cause a persistent denial of service (CPU exhaustion and HTTP worker thread pool starvation requiring a server restart) via crafted search queries containing deeply nested parentheses sent to query evaluation endpoints (/changes/?q=, /accounts/?q=, /groups/?query=, /projects/?query=, /Documentation/?q=, /changes/{id}/query?expression=, or SSH gerrit query). Because syntactic predicates in conditionOr and conditionAnd recurse via conditionBase without memoization prior to capability or visibility checks and worker threads do not abort when the client disconnects, a small number of requests (such as 25 requests matching default httpd.maxThreads) can permanently pin all HTTP worker threads. This issue is fixed in Gerrit Code Review versions 3.12.10, 3.13.9, and 3.14.3.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.