CVE-2026-59877 — protobufjs: Denial of Service via infinite loop in .proto option parsing
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 reachi…
Published: 2026-07-08 · CVSS: 5.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7