CVE-2026-59876
MEDIUM SEVERITYCVSS Score & Metrics
Base Score
4.8 / 10
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Vulnerability Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key __proto__ to change the prototype of the returned map object instead of creating an own map entry in protobufjs/ext/textformat. This issue is fixed in version 8.6.5.
Vulnerability Details
Published Date
Last Modified
CWE ID
CWE-1321
Source
NVD
Vendor
protobufjs
Product
protobuf.js
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