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CVE-2026-59876

nvd nist
Published: Jul 8, 2026Modified: Jul 13, 2026

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4.8
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Exploitability: 2.2 / Impact: 2.5
Source: NVD

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.

Affected (1)

Protobufjs Project
1 product
Protobufjs
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Protobufjs
From 8.2.0 to 8.6.5

Related CWEs

CWE-1321
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

References (4)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Issue TrackingPatch
Source: security-advisories@github.com
ProductRelease Notes
Source: security-advisories@github.com
MitigationVendor Advisory

Timeline

No history available yet.