Security Advisory

CVE-2026-59876

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 15:31:11

Last updated 2026-07-09 14:41:45

Assigner GitHub_M

CVSS score 4.8

State PUBLISHED

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.

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