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CVE-2026-41242

CriticalPublished

protobufjs has an arbitrary code execution issue

Published: Apr 18, 2026
Updated: Sep 9, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

9.4/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 53.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

protobufjs compiles protobuf definitions into JavaScript (JS) functions. In versions prior to 8.0.1 and 7.5.5, attackers can inject arbitrary code in the "type" fields of protobuf definitions, which will then execute during object decoding using that definition. Versions 8.0.1 and 7.5.5 patch the issue.

Sources

CVE-2026-41242Exploit
Exploit PoC for CVE-2026-41242, critical protobuf.js code injection to RCE via crafted type names. Includes vulnerable Node app, local PoC, and remote Python exploit script.
CVE-2026-41242PoC
Proof-of-concept exploit for CVE-2026-41242 in a Node.js web application, demonstrating the vulnerability and potential impact.

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