CVE-2026-103636

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Source

https://cve.org/CVERecord?id=CVE-2026-103636

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103636.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-103636

Published

2026-10-10T10:23:58Z

Modified

2026-10-12T02:30:57Z

Summary

Apache DataSketches: datasketches-cpp: Out-of-bounds read in VarOpt union deserialization allows denial of service via a truncated sketch

Details

Out-of-bounds read in the VarOpt union deserialization of Apache DataSketches C++ (repo: datasketches-cpp).

var_opt_union::deserialize() read the 32-byte preamble of a non-empty union after checking that only 8 bytes were available, so a truncated serialized union could cause a read of up to 24 bytes past the end of the input. For such inputs, the size remaining for the embedded sketch was also computed by an unsigned subtraction that could wrap around, so the embedded sketch's own size checks no longer limited reads to the input. The bytes read can become part of the deserialized union's state. This can cause a crash (denial of service) and could expose adjacent memory contents.

This issue affects Apache DataSketches C++: from 2.0.0-incubating before 5.3.0. Only applications that deserialize VarOpt unions from untrusted sources are affected.

Users are recommended to upgrade to version 5.3.0, which fixes this issue.

Database specific

{
    "cna_assigner":  "apache",
    "cwe_ids":  [
        "CWE-125",
        "CWE-191"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103636.json"
}

References

Affected packages

Git / github.com/apache/datasketches-cpp

Affected ranges

Type

GIT

Repo

https://github.com/apache/datasketches-cpp

Events

Introduced

90b66895c24d843f455ada80e9cc82927188cae7

Fixed

5b5524f55d121225a7909c2851271327684585d7

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "2.0.0-incubating"
        },
        {
            "last_affected":  "5.2.0"
        },
        {
            "fixed":  "5.3.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103636.json"