CVE-2026-44290

A flaw was found in protobufjs. This vulnerability allows an attacker to craft a protobuf schema or JSON descriptor that, when processed, can traverse through inherited object properties. This can lead to writing to global JavaScript constructors, corrupting process-wide built-in functionality. The most significant impact is a denial of service (DoS).

This is an Important denial of service vulnerability in protobufjs. A remote attacker could provide a specially crafted protobuf schema or JSON descriptor, which, when processed by an application using protobufjs, could corrupt process-wide built-in functionality, leading to a persistent denial of service. This impact is contingent on the application parsing untrusted schemas or descriptors.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, Red Hat recommends configuring applications to avoid parsing or loading protobuf schemas or JSON descriptors from untrusted sources. If processing untrusted schemas is unavoidable, implement strict validation to reject option names containing unsafe property path components before loading them. Additionally, consider running schema processing in an isolated environment to limit the blast radius of potential corruption.