CVE-2026-89418

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

Published Sep 17, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Google
Google protobuf-javascript
Vendors & Products Google
Google protobuf-javascript
Type Values Removed Values Added
Weaknesses CWE-606
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Uncontrolled Recursion leading to Denial of Service in protobuf-javascript (google-protobuf)
Weaknesses CWE-674
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Google
Published
Updated
Sep 17, 2026, 7:38 PM
Reserved
Sep 11, 2026, 6:09 PM
Status
Awaiting Analysis
Published
Sep 17, 2026, 2:17 PM
Modified
Sep 18, 2026, 1:45 PM
Severity
Important
Public date
Sep 17, 2026, 1:27 PM