What’s Vulnerable › Vulnerabilities
CVE-2026-44292: protobufjs: Prototype injection in generated message constructors
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-13 · updated 2026-06-17
- Weakness: CWE-1321
Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated message constructors copied enumerable properties from a provided properties object without filtering the __proto__ key. If an application constructed a message from an attacker-controlled plain object, an own enumerable __proto__ property could alter the prototype of that individual message instance. This vulnerability is fixed in 7.5.6 and 8.0.2.
Affected products
- protobufjs: before 7.5.6; from 8.0.0 before 8.0.2 — fixed in 7.5.6, 8.0.2
How to fix
Upgrade to a fixed version: protobufjs 7.5.6, 8.0.2. Check the vendor advisory for mitigations.
References
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