CVE-2026-103635

Out-of-bounds read in the compact Theta sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). compact_theta_sketch::deserialize() and wrapped_compact_theta_sketch::wrap() read header fields before checking that the input was long enough. For the compressed format, the size check could be defeated by a 32-bit overflow, and two header fields that control decoding were not validated; this also affected deserialization from a stream. A crafted or truncated sketch could cause a read past the end of the input. In the compressed case the over-read can be large, and the bytes read can become part of the deserialized sketch. This can cause a crash (denial of service) and could expose adjacent memory contents. This issue affects Apache DataSketches C++: from 3.1.0 before 5.3.0. Only applications that deserialize Theta sketches from untrusted sources are affected. Users are recommended to upgrade to version 5.3.0, which fixes this issue.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/apache/datasketches-cpp/releases/tag/5.3.0
https://lists.apache.org/thread/15b86y9jstco39kzppjw7l5kvhjvwqvv
http://www.openwall.com/lists/oss-security/2026/10/10/5

Configurations

No configuration.

History

16 Oct 2026, 16:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1

10 Oct 2026, 13:17

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/10/10/5 -

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-2026-103635

Mitre link : CVE-2026-103635

CVE.ORG link : CVE-2026-103635

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

CWE-190

Integer Overflow or Wraparound

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