CVE-2026-103634

Out-of-bounds read and write in the Count-Min sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). count_min_sketch::deserialize() did not include the preamble in its input size check, so a truncated sketch could cause a read of up to 16 bytes past the end of the input. In addition, the table size was computed from the serialized number of buckets and number of hash functions in 32-bit arithmetic. A crafted sketch could make it wrap to zero, so that the sketch deserialized with an empty table, and later updates and estimate queries read and wrote outside the heap allocation. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. This issue affects Apache DataSketches C++: from 4.1.0 before 5.3.0. Only applications that deserialize Count-Min sketches from untrusted sources are affected. Users are recommended to upgrade to version 5.3.0, which fixes this issue.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/apache/datasketches-cpp/releases/tag/5.3.0
https://lists.apache.org/thread/rkx9oh06g5cjc6vmmpqloxwfz0gzz01h
http://www.openwall.com/lists/oss-security/2026/10/10/4

Configurations

No configuration.

History

26 Oct 2026, 14:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.3

22 Oct 2026, 09:17

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/10/10/4 -

22 Oct 2026, 07:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-22 07:16

Updated : 2026-10-26 14:16

NVD link : CVE-2026-103634

Mitre link : CVE-2026-103634

CVE.ORG link : CVE-2026-103634

JSON object : View

Products Affected

No product.

CWE

CWE-190

Integer Overflow or Wraparound

CWE-787

Out-of-bounds Write

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