Unscored CVE-2026-123338 EUVD-2026-125274GHSA-f29r-h9w7-gp62

Apache DataSketches C++: Out-of-bounds write in REQ 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 REQ sketch from an untrusted source
can have heap memory corrupted by a crafted sketch, because the
serialized compactor headers were not validated.

This issue affects Apache DataSketches C++: from 3.0.0 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++	3.0.0 – ≤ 5.3.0	—

References

https://lists.apache.org/thread/wjsso4wl0f0nczwh7gd74kc5wckn1635 vendor-advisory
https://github.com/apache/datasketches-cpp/releases/tag/5.3.1 release-notes
https://github.com/apache/datasketches-cpp/commit/9839ffd2ccc038d453e38b545750a5ed2d589dea patch
https://github.com/apache/datasketches-cpp/pull/568 patch