npm/protobufjs CVE-2026-59876: medium 4.8, EPSS 0.35%

protobufjs: Text Format string map parsing can mutate returned map object prototype

Action: Upgrade protobufjs to 8.6.5 or later.

npm i protobufjs@8.6.5

Affected

Fixed versions

Sources

• osv: GHSA-jfj6-75fj-8934
• https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jfj6-75fj-8934
• https://nvd.nist.gov/vuln/detail/CVE-2026-59876
• https://github.com/protobufjs/protobuf.js/pull/2335
• https://github.com/protobufjs/protobuf.js/commit/9f97fe413072d3beb52c74e62d88ea8adc9444d8
• https://github.com/protobufjs/protobuf.js
• https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.5

CVE-2026-59876 · published 2026-07-20T22:04:07Z · modified 2026-09-10T03:50:12.269296263Z · JSON