Answer in brief
CVE-2026-89418 records a High severity (CVSS 8.7) 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.
CVSS is 8.7. 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.
The current feed maps Google/protobuf-javascript (aka google-protobuf npm package) (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Google/protobuf-javascript (aka google-protobuf npm package)generic | All versions | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.