CVE-2026-59876
Medium · 4.8CVSS
4.8
EPSS
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Published
Jul 8, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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