CVE-2026-54269: CWE-674: Uncontrolled Recursion in protobufjs protobuf.js
protobuf.js versions prior to 8.6.0 and 7.6.3 contain a vulnerability where certain schema-derived names can collide with internal runtime helper properties. This can cause uncontrolled recursion or deterministic exceptions during decoding, verification, object conversion, JSON serialization, or RPC helper invocation. The issue arises from accepting field or service method names like hasOwnProperty, $type, or rpcCall that interfere with protobufjs internals. This vulnerability has a medium severity score of 5.3 and is fixed in versions 8.6.0 and 7.6.3.
AI Analysis
Technical Summary
protobuf.js compiles protobuf definitions into JavaScript functions. Versions prior to 8.6.0 and 7.6.3 accept certain schema-derived names that collide with protobufjs runtime helper properties such as hasOwnProperty, $type, and rpcCall. When message or service types using these names are processed, protobuf.js may read schema-controlled data where it expects internal helpers, causing deterministic exceptions or uncontrolled recursion during decode post-checks, verification, object conversion, reflected JSON serialization, or RPC helper invocation. This vulnerability is addressed in protobuf.js versions 8.6.0 and 7.6.3.
Potential Impact
The vulnerability can cause denial of service conditions due to deterministic exceptions or uncontrolled recursion leading to application crashes or hangs. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade protobuf.js to version 8.6.0 or later, or 7.6.3 or later, where this vulnerability is fixed. No other mitigations are documented. Patch status is not explicitly stated in the vendor advisory, but the fixed versions are clearly identified.
CVE-2026-54269: CWE-674: Uncontrolled Recursion in protobufjs protobuf.js
Description
protobuf.js versions prior to 8.6.0 and 7.6.3 contain a vulnerability where certain schema-derived names can collide with internal runtime helper properties. This can cause uncontrolled recursion or deterministic exceptions during decoding, verification, object conversion, JSON serialization, or RPC helper invocation. The issue arises from accepting field or service method names like hasOwnProperty, $type, or rpcCall that interfere with protobufjs internals. This vulnerability has a medium severity score of 5.3 and is fixed in versions 8.6.0 and 7.6.3.
CVSS v3.1
Score 5.3medium
Affected software
pkg:npm/protobufjs/protobuf.jsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
protobuf.js compiles protobuf definitions into JavaScript functions. Versions prior to 8.6.0 and 7.6.3 accept certain schema-derived names that collide with protobufjs runtime helper properties such as hasOwnProperty, $type, and rpcCall. When message or service types using these names are processed, protobuf.js may read schema-controlled data where it expects internal helpers, causing deterministic exceptions or uncontrolled recursion during decode post-checks, verification, object conversion, reflected JSON serialization, or RPC helper invocation. This vulnerability is addressed in protobuf.js versions 8.6.0 and 7.6.3.
Potential Impact
The vulnerability can cause denial of service conditions due to deterministic exceptions or uncontrolled recursion leading to application crashes or hangs. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade protobuf.js to version 8.6.0 or later, or 7.6.3 or later, where this vulnerability is fixed. No other mitigations are documented. Patch status is not explicitly stated in the vendor advisory, but the fixed versions are clearly identified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-12T17:13:32.279Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39735beed863c81e396249
Added to database: 06/22/2026, 17:39:39 UTC
Last enriched: 06/22/2026, 17:55:59 UTC
Last updated: 06/22/2026, 20:22:15 UTC
Views: 3
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