What’s Vulnerable › Vulnerabilities
CVE-2026-44291: protobufjs: Code generation gadget after prototype pollution
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% 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-94
Description
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs used plain objects with inherited prototypes for internal type lookup tables used by generated encode and decode functions. If Object.prototype had already been polluted, those lookup tables could resolve attacker-controlled inherited properties as valid protobuf type information. This could cause attacker-controlled strings to be emitted into generated JavaScript code. 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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