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CVE-2026-103501— Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allows memory corruption 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++（代码仓库：datasketches-cpp）中存在一个堆缓冲区溢出漏洞，发生在 HLL（HyperLogLog）草图反序列化过程中。 在 LIST 模式下反序列化草图时（无论是从字节缓冲区还是流中读取），程序会从输入中读取 coupon 计数，并直接将其用作向固定大小为 8 个条目的缓冲区中复制数据的条目数，而未对该计数值是否超过缓冲区容量进行检查。攻击者可构造恶意草图，导致程序在该内部堆缓冲区末尾之后最多写入 988 字节。这会破坏堆内存，引发程序崩溃，并可能为进一

AI Predicted 7.5 Difficulty: Moderate

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache DataSketches 1.0.0-incubating≤ 5.2.0 affected
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I. Basic Information for CVE-2026-103501

Vulnerability Information
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Vulnerability Title
Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allows memory corruption via a crafted sketch
Source: CVE Program / CVE List V5
Vulnerability Description
Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). When deserializing a sketch in LIST mode, from either a byte buffer or a stream, the coupon count was read from the input and used as the number of entries to copy into a fixed buffer of 8 entries, without checking it against the buffer's capacity. A crafted sketch could cause a write of up to 988 bytes past the end of this internal heap buffer. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. This issue affects Apache DataSketches C++: from 1.0.0-incubating before 5.3.0. Only applications that deserialize HLL 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
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache DataSketches 1.0.0-incubating ~ 5.2.0 -

II. Public POCs for CVE-2026-103501

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III. Intelligence Information for CVE-2026-103501

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Mailing List Discussions for CVE-2026-103501 (1)

Vendor Pages for CVE-2026-103501 (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-2026-103635 Apache DataSketches: datasketches-cpp: Out-of-bounds read in compact Theta sketch deserial
CVE-2026-103513 Apache DataSketches: datasketches-cpp: Out-of-bounds read and write in the CPC sketch dese

IV. Related Vulnerabilities

Same product: Apache DataSketches
Same vendor: Apache Software Foundation
Same weakness: CWE-122

V. Comments for CVE-2026-103501

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