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CVE WatchSep 18, 2026

CVE-2026-89418

google-protobuf contains an unbounded recursion when parsing unknown protobuf group fields. An attacker can send a small crafted payload of

CVSS

No CVSS

EPSS

0.4%

p31

KEV

Exploit Today

9

0-100

Published: Sep 17, 2026 · Last modified: Sep 18, 2026 · CWE-674

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references
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