Unscored CVE-2026-123274 EUVD-2026-125275GHSA-v92m-x8fp-25xm

Apache DataSketches C++: Out-of-bounds write in KLL sketch deserialization allows memory corruption via a crafted sketch

Published Nov 13, 2026 · Updated Nov 13, 2026 · Assigned by apache

Vendor: Apache Software Foundation Product: Apache DataSketches C++

Description

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.

Affected products

Vendor	Product	Affected	Fixed
Apache Software Foundation	Apache DataSketches C++	1.0.0-incubating – ≤ 5.3.0	—

References

https://lists.apache.org/thread/t4rngyg9cbv1b42f1d0crgpgtpby0594 vendor-advisory
https://github.com/apache/datasketches-cpp/releases/tag/5.3.1 release-notes
https://github.com/apache/datasketches-cpp/commit/bb86d439db494e3d362e54cc4f83481893974335 patch
https://github.com/apache/datasketches-cpp/pull/568 patch