Gerrit up to 3.12.9/3.13.8/3.14.2 Regex Search dk.brics.automaton toAutomaton resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in Gerrit up to 3.12.9/3.13.8/3.14.2. Affected by this vulnerability is the function toAutomaton of the file dk.brics.automaton of the component Regex Search. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2026-87722. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Gerrit up to 3.12.9/3.13.8/3.14.2. It has been rated as problematic. This issue affects the function toAutomaton of the file dk.brics.automaton of the component Regex Search. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

Uncontrolled Resource Consumption (CWE-400 / CWE-1333) in regex search query predicates (such as RegexProjectPredicate, RegexRefPredicate, RegexPathPredicate, and sibling predicates) and REST regex filter endpoints (RegexListSearcher /projects/?r= and RefFilter /projects/{project}/branches/?r=) 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 containing regular expressions with large counted repetitions or exponential DFA determinization patterns. Because the user-supplied regular expression is compiled into an unbounded dk.brics.automaton instance (new RegExp(re).toAutomaton()) on the request thread prior to index evaluation or access control visibility filtering, trivial queries can exhaust JVM heap or pin request threads regardless of heap size. This issue is fixed in Gerrit Code Review versions 3.12.10, 3.13.9, and 3.14.3.

The advisory is shared at issues.gerritcodereview.com. The identification of this vulnerability is CVE-2026-87722 since 09/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 3.12.10, 3.13.9 or 3.14.3 eliminates this vulnerability.

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Productinfo

Name

• Gerrit

Version

• 3.12.0
• 3.12.1
• 3.12.2
• 3.12.3
• 3.12.4
• 3.12.5
• 3.12.6
• 3.12.7
• 3.12.8
• 3.12.9
• 3.13.0
• 3.13.1
• 3.13.2
• 3.13.3
• 3.13.4
• 3.13.5
• 3.13.6
• 3.13.7
• 3.13.8
• 3.14.0
• 3.14.1
• 3.14.2

CPE 2.3info

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CPE 2.2info

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