Vulnerability Description
protobufjs-cli is the command line add-on for protobuf.js. Prior to 1.3.2 and 2.5.0, a previous fix for unsafe name handling in pbjs static / static-module code generation was incomplete. Affected versions of protobufjs-cli could still emit unsafe JavaScript references when generating static output from crafted JSON descriptor input. The common case of parsing schemas from .proto files is not affected. This is a bypass of CVE-2026-44295. An attacker who can provide or influence pre-parsed JSON descriptors passed to pbjs static code generation may be able to cause generated JavaScript output to contain attacker-controlled code. The injected code may execute if the generated file is later executed or imported and an affected generated API path is invoked. This vulnerability is fixed in 1.3.2 and 2.5.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Protobufjs Project | Protobufjs-Cli | < 1.3.2 |
Related Weaknesses (CWE)
References
- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-pr59-h9ph-3frMitigationVendor Advisory
FAQ
What is CVE-2026-54271?
CVE-2026-54271 is a vulnerability with a CVSS score of 8.2 (HIGH). protobufjs-cli is the command line add-on for protobuf.js. Prior to 1.3.2 and 2.5.0, a previous fix for unsafe name handling in pbjs static / static-module code generation was incomplete. Affected ver...
How severe is CVE-2026-54271?
CVE-2026-54271 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54271?
Check the references section above for vendor advisories and patch information. Affected products include: Protobufjs Project Protobufjs-Cli.