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CVE-2026-59876

MEDIUM
4.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-59876
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-07-07 15:41 UTC
Published
2026-07-08 15:31 UTC
Last updated
2026-07-08 15:31 UTC
Primary CWE
CWE-1321
CWE-1321: Improperly Controlled Modification of Object Proto…
Vendor / Product
protobufjs / protobuf.js
Sources
cve.org  ·  NVD

Severity & Metrics

4.8 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
protobufjs protobuf.js — >= 8.2.0, < 8.6.5
Weakness (CWE)
CWESourceDescription
CWE-1321 cna CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.8 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References (4)
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