CVE-2026-89418
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
Product
Protobuf-javascript (aka Google-protobuf Npm Package)
PublishedSep 17, 2026
First seenSep 17, 2026
Weakness typeCWE-674CWE-674
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Google protobuf-javascript (aka google-protobuf npm package) | No range specified | — |
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