Apache DataSketches: datasketches-cpp: Out-of-bounds read and write in Count-Min sketch deserialization allows memory corruption via a crafted sketch

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-103634
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 07:16:40 UTC
Updated2026-10-22 07:16:40 UTC
DescriptionOut-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.

Risk And Classification

Problem Types: CWE-190 | CWE-787 | CWE-787 CWE-787 Out-of-bounds write | CWE-190 CWE-190 Integer overflow or wraparound

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache DataSketches affected 4.1.0 5.2.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/apache/datasketches-cpp/releases/tag/5.3.0 [email protected] github.com
lists.apache.org/thread/rkx9oh06g5cjc6vmmpqloxwfz0gzz01h [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/10/10/4 ADP www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: He Huang (en)

CNA: NexusSan (en)

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