CVE-2026-87721
HighCVSS 8.7Summary
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. The issue stems from syntactic predicates recursing without memoization prior to capability or visibility checks, and worker threads not aborting when the client disconnects. This issue is fixed in versions 3.12.10, 3.13.9, and 3.14.3.
Risk Assessment
A small number of requests (e.g., 25 matching the default httpd.maxThreads) can permanently pin all HTTP worker threads, causing Gerrit unavailability and requiring a server restart. This may paralyze the code review process and halt development teams' work.
Recommendation
Upgrade Gerrit Code Review to version 3.12.10, 3.13.9, or 3.14.3. Until then, consider restricting access to query endpoints and monitoring the number and complexity of incoming queries.
Other vulnerabilities in Gerrit Code Review
See all- CVE-2026-87722High
Uncontrolled Resource Consumption (CWE-400 / CWE-1333) in regex search query predicates and REST regex filter endpoints in Gerrit Code Review versions 2.1.6 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 denial of service (CPU starvation and JVM heap exhaustion / OutOfMemoryError) via crafted search queries or REST API requests. The issue stems from compiling user-supplied regular expressions into an unbounded dk.brics.automaton instance on the request thread prior to index evaluation or access control visibility filtering. This issue is fixed in versions 3.12.10, 3.13.9, and 3.14.3.
- CVE-2026-87720High
Incorrect Authorization (CWE-863) in project name normalization (ProjectUtil.stripGitSuffix) and ProjectCache eviction logic (ProjectCacheImpl) in Gerrit Code Review versions 2.16.0 through 3.12.9, 3.13.0 through 3.13.8, and 3.14.0 through 3.14.2 allows an authenticated user (or an unauthenticated user if the repository was previously public) to cause unauthorized disclosure of private repository content and durable restoration of revoked project-owner administrative privileges. The issue stems from stripping only a single terminal .git suffix when constructing the ProjectCache key while JGit resolves the suffixed alias to the same canonical bare repository on disk. This issue is fixed in versions 3.12.10, 3.13.9, and 3.14.3.
Original NVD description (English source)
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.