CVE-2026-123274

2026-11-13

Out-of-bounds Write vulnerability in Apache DataSketches C++. An application that deserializes a KLL sketch from an untrusted source can have heap memory corrupted by a crafted sketch, because the serialized level boundaries were not validated. This issue affects Apache DataSketches C++: 2.

Out-of-bounds Write vulnerability in Apache DataSketches C++. An

application that deserializes a KLL sketch from an untrusted source

can have heap memory corrupted by a crafted sketch, because the

serialized level boundaries were not validated.

This issue affects Apache DataSketches C++: 2.0.0 through 5.3.0.

Users are recommended to upgrade to version 5.3.1, which fixes the

issue.