CVE WatchOct 16, 2026

CVE-2026-103501

Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). When deserializing a sketch in

CVSS

9.8

Critical

EPSS

0.7%

p51

KEV

—

Exploit Today

0-100

Published: Oct 10, 2026 · Last modified: Oct 16, 2026 · CWE-122 · CWE-1284

EPSS · 30d

0.2%EPSS · 30 days0.7%

2026-10-112026-10-23

Technical 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.

Official references

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