medium5.3
CVE-2026-59877
protobufjs compiles protobuf definitions into JavaScript (JS) functions.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | protobufjs | >= 7.5.0, <= 7.6.4 | 7.6.5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Protobufjs Project | Protobufjs | before 7.6.5 from 8.0.0 before 8.6.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-j3f2-48v5-ccww
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-j3f2-48v5-ccww
- https://nvd.nist.gov/vuln/detail/CVE-2026-59877
- 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