VDB-358208 · CVE-2026-41242 · GHSA-xq3m-2v4x-88gg

protobufjs protobuf.js up to 7.5.4/8.0.0 Type code injection

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	10.00

Summaryinfo

A vulnerability was found in protobufjs protobuf.js up to 7.5.4/8.0.0 and classified as critical. This issue affects some unknown processing. Such manipulation of the argument Type leads to code injection. This vulnerability is listed as CVE-2026-41242. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in protobufjs protobuf.js up to 7.5.4/8.0.0. It has been rated as critical. Affected by this issue is an unknown code. The manipulation of the argument type with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-41242 since 04/18/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 7.5.5 or 8.0.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 535df444ac060243722ac5d672db205e5c531d75 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-23678). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

JavaScript Library

Vendor

protobufjs

Name

protobuf.js

Version

License

open-source

Website

Product: https://github.com/protobufjs/protobuf.js/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: protobuf.js 7.5.5/8.0.1
Patch: 535df444ac060243722ac5d672db205e5c531d75

Timelineinfo

04/18/2026 Advisory disclosed
04/18/2026 +0 days CVE reserved
04/18/2026 +0 days VulDB entry created
04/18/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-xq3m-2v4x-88gg
Status: Confirmed

CVE: CVE-2026-41242 (🔒)
GCVE (CVE): GCVE-0-2026-41242
GCVE (VulDB): GCVE-100-358208
EUVD: 🔒

Entryinfo

Created: 04/18/2026 22:03
Updated: 04/18/2026 22:37
Changes: 04/18/2026 22:03 (72), 04/18/2026 22:37 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.