PT-2026-56497 · Protobufjs · Protobufjs

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-59877

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2026-59877

Affected Products

Protobufjs

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-59877 · Security Note
• https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww · Note
• https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f · Note
• https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5 · Note
• https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6 · Note
• https://github.com/protobufjs/protobuf.js/pull/2352 · Note
• https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217 · Note