CVE-2026-103501

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/apache/datasketches-cpp/releases/tag/5.3.0
https://lists.apache.org/thread/n2oc2j841dzsv4239jjp08of66bo79c5
http://www.openwall.com/lists/oss-security/2026/10/10/2

Configurations

No configuration.

History

16 Oct 2026, 16:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8

10 Oct 2026, 13:17

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/10/10/2 -

10 Oct 2026, 11:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-10 11:17

Updated : 2026-10-16 16:16

NVD link : CVE-2026-103501

Mitre link : CVE-2026-103501

CVE.ORG link : CVE-2026-103501

JSON object : View

Products Affected

No product.

CWE

CWE-122

Heap-based Buffer Overflow

CWE-1284

Improper Validation of Specified Quantity in Input

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