CVE-2026-41242criticalCWE-94

CVE-2026-41242: critical vulnerability in protobufjs protobuf.js

protobufjs has an arbitrary code execution issue

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.4epss 0.8%
protobufjs compiles protobuf definitions into JavaScript (JS) functions. In versions prior to 8.0.1, 7.5.5, and 6.11.6, 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, 7.5.5, and 6.11.6 patch the issue.
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
Affected products
protobufjs · protobuf.js
Related CVEs — protobufjs protobuf.js

In the same product, most dangerous first.

CVE-2026-44289HIGHprotobufjs: Denial of service through unbounded protobuf recursionEPSS 0.6%CVE-2026-44291HIGHprotobufjs: Code generation gadget after prototype pollutionEPSS 0.5%CVE-2026-48712HIGHprotobufjs: Denial of service through unbounded Any expansion during JSON conversionEPSS 0.5%CVE-2026-44294MEDIUMprotobufjs: Denial of service from crafted field names in generated codeEPSS 0.4%CVE-2026-44293HIGHprotobufjs: Code injection through bytes field defaults in generated toObject codeEPSS 0.4%CVE-2026-54269MEDIUMprotobufjs: Schema-derived names can shadow runtime-significant propertiesEPSS 0.4%