CVE-2026-41242

Name: CVE-2026-41242
Creator: NVD / NIST
Published: 2026-04-18T17:16:13.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.4/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2026-41242 is a critical-severity vulnerability rated 9.4/10 on the CVSS scale. 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. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

9.4/10

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

0.57%

43.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Protobufjs Project	Protobufjs	< 7.5.5
Protobufjs Project	Protobufjs	8.0.0

References

https://github.com/protobufjs/protobuf.js/commit/535df444ac060243722ac5d672db205e5c531d75Patch
https://github.com/protobufjs/protobuf.js/commit/ff7b2afef8754837cc6dc64c864cd111ab477956Patch
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v7.5.5Product, Release Notes
https://github.com/protobufjs/protobuf.js/releases/tag/protobufjs-v8.0.1Product, Release Notes
https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-xq3m-2v4x-88ggExploit, Vendor Advisory

Timeline

Published: Apr 18, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-41242?

How severe is CVE-2026-41242?

CVE-2026-41242 has a CVSS score of 9.4/10 (CRITICAL severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2026-41242?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41242?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST