Prototype Manipulation in Protobuf.js Versions Prior to 7.5.6 and 8.0.2
CVE-2026-44290

7.5HIGH

Key Information:

Vendor

Protobufjs

Status
Protobuf.js
Vendor
CVE Published:
13 May 2026

What is CVE-2026-44290?

Prior to releases 7.5.6 and 8.0.2, Protobuf.js had a significant issue where it permitted certain schema option paths to leverage inherited object properties while managing options. An attacker could exploit this by crafting a malicious protobuf schema or JSON descriptor, potentially allowing option handling to write to properties in global JavaScript constructors. This could corrupt essential built-in functionalities across the process. The vulnerability has been effectively addressed in versions 7.5.6 and 8.0.2.

Affected Version(s)

protobuf.js < 7.5.6 < 7.5.6

protobuf.js >= 8.0.0, < 8.0.2 < 8.0.0, 8.0.2

References

https://github.com/protobufjs/protobuf.js/security/adviso...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.