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Message-ID: <0b2a2d8c-1f86-00d0-3230-d36bb8e56a5c@apache.org>
Date: Fri, 09 Oct 2026 22:18:43 +0000
From: Lee Rhodes <leerho@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-103635: Apache DataSketches: datasketches-cpp:
Out-of-bounds read in compact Theta sketch deserialization allows denial
of service via a crafted sketch
Severity: low
Affected versions:
- Apache DataSketches 3.1.0 through 5.2.0
Description:
Out-of-bounds read in the compact Theta sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).
compact_theta_sketch::deserialize() and wrapped_compact_theta_sketch::wrap() read header fields before checking that the input was long enough. For the compressed format, the size check could be defeated by a 32-bit overflow, and two header fields that control decoding were not validated; this also affected deserialization from a stream. A crafted or truncated sketch could cause a read past the end of the input. In the compressed case the over-read can be large, and the bytes read can become part of the deserialized sketch. This can cause a crash (denial of service) and could expose adjacent memory contents.
This issue affects Apache DataSketches C++: from 3.1.0 before 5.3.0. Only applications that deserialize Theta sketches from untrusted sources are affected.
Users are recommended to upgrade to version 5.3.0, which fixes this issue.
Credit:
He Huang (finder)
NexusSan (tool)
References:
https://datasketches.apache.org
https://www.cve.org/CVERecord?id=CVE-2026-103635
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