CVE-2026-59877

Summary

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.

Affected Software

Weaknesses

• CWE-835: CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww
• https://github.com/protobufjs/protobuf.js/pull/2352
• https://github.com/protobufjs/protobuf.js/commit/10fba6d54815ceecca8a06b9a6db490c8f5d2217
• https://github.com/protobufjs/protobuf.js/commit/fa5c73add738ceb471e74da8cc2f3727c3d0a69f
• https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.6.5
• https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.6.6

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