Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M
CVE-2026-54271protobufjs-cli: Code injection in pbjs static output from crafted JSON descriptor names
High 8.2
In plain English
A high-severity code injection in protobufjs-cli from protobufjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | protobufjs-cli | 1.3.2 | GHSA-pr59-h9ph-3fr8 |
| npm | protobufjs-cli | 2.5.0 | GHSA-pr59-h9ph-3fr8 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| protobufjs | protobufjs-cli | < 1.3.2>= 2.0.0, < 2.4.2 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L