CVE-2026-44291
HIGHprotobufjs: Code generation gadget after prototype pollution
Title source: cnaDescription
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. This vulnerability is fixed in 7.5.6 and 8.0.2.
References (1)
Core 1
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-75px-5xx7-5xc7
Scores
CVSS v3
8.1
EPSS
0.0002
EPSS Percentile
6.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-94
Status
published
Products (5)
npm/protobufjs
0 - 7.5.6npm
npm/protobufjs
8.0.0 - 8.0.2npm
protobufjs/protobuf.js
< 7.5.6
protobufjs/protobuf.js
>= 8.0.0, < 8.0.2
protobufjs_project/protobufjs
< 7.5.6
Published
May 13, 2026
Tracked Since
May 13, 2026