CVE-2026-103513

Out-of-bounds read and write in the CPC sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). A crafted serialized CPC sketch passed to cpc_sketch::deserialize(), from either a byte buffer or a stream, can cause the decompressor to read past the end of the compressed data, because the read position was only checked after decoding finished. In the hybrid flavor, it can also cause a write outside an internal heap buffer, because decoded row indices were not validated. Several other header fields and decoded values, including lg_k, were also not validated. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. This issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize CPC 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/s7wyoqyf120dl5ys8jtr26dskd6m485h
http://www.openwall.com/lists/oss-security/2026/10/10/3

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/2026/10/10/3 -

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-2026-103513

Mitre link : CVE-2026-103513

CVE.ORG link : CVE-2026-103513

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

CWE-787

Out-of-bounds Write

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