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CVE-2026-103635— Apache DataSketches: datasketches-cpp: Out-of-bounds read in compact Theta sketch deserialization allows denial of service via a crafted sketch

Quick assessment

Affected
Apache Software Foundation Apache DataSketches
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache DataSketches C++（仓库：datasketches-cpp）中，compact Theta sketch 反序列化过程存在越界读取漏洞。 和 函数在验证输入数据长度之前，就读取了头字段。对于压缩格式，32 位整数溢出可能导致长度检查被绕过；同时，控制解码的两个头字段未经过有效性验证；该问题也影响了从数据流进行的反序列化操作。恶意构造或截断的 sketch 数据可能导致程序读取超出输入数据边界的内容。在压缩格式的情况下，越界读取的范围可能较大，且被读取的字节可能被嵌入到反序列化后的 ske

AI Predicted 7.5 Difficulty: Moderate

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache DataSketches 3.1.0≤ 5.2.0 affected
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I. Basic Information for CVE-2026-103635

Vulnerability Information
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Vulnerability Title
Apache DataSketches: datasketches-cpp: Out-of-bounds read in compact Theta sketch deserialization allows denial of service via a crafted sketch
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache DataSketches 3.1.0 ~ 5.2.0 -

II. Public POCs for CVE-2026-103635

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III. Intelligence Information for CVE-2026-103635

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Mailing List Discussions for CVE-2026-103635 (1)

Vendor Pages for CVE-2026-103635 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-10 · 4 CVEs total

CVE-2026-103636 Apache DataSketches: datasketches-cpp: Out-of-bounds read in VarOpt union deserialization
CVE-2026-103513 Apache DataSketches: datasketches-cpp: Out-of-bounds read and write in the CPC sketch dese
CVE-2026-103501 Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allo

IV. Related Vulnerabilities

Same product: Apache DataSketches
Same vendor: Apache Software Foundation
Same weakness: CWE-125

V. Comments for CVE-2026-103635

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