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

Unknown severity · Source severity not reportedCVE-2026-89418

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

Answer in brief

CVE-2026-89418 records a Unknown severity vulnerability in Uncontrolled Recursion leading to Denial of Service in protobuf-javascript (google-protobuf). The current sources do not mark it as known exploited. The current feed maps Google/protobuf-javascript (aka google-protobuf npm package) (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Google/protobuf-javascript (aka google-protobuf npm package) (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Google/protobuf-javascript (aka google-protobuf npm package)generic	All versions	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Google/protobuf-javascript (aka google-protobuf npm package).
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.