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Vulnerability · Published Sep 17, 2026 · Assigned by Google

CVE-2026-89418Uncontrolled Recursion leading to Denial of Service in protobuf-javascript (google-protobuf)

High 8.7

In plain English

A high-severity security flaw in protobuf-javascript (aka google-protobuf npm package) from Google. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.3%top 79.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

google-protobuf contains an unbounded recursion when parsing unknown protobuf group fields. An attacker can send a small crafted payload of deeply nested START_GROUP wire bytes to any Node.js service that calls the generated deserializeBinary() API, causing a RangeError: Maximum call stack size exceeded and crashing the process. No authentication or prior knowledge of the schema is required.

Affected products (as reported)

VendorProductVersions
Google protobuf-javascript (aka google-protobuf npm package) All versions

Weakness: CWE-674 · Vector: 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

References