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VulnerabilityPublished

CVE-2026-123274: Apache DataSketches C++ · Out-of-bounds Write Vulnerability

Affects datasketches-cppSource GCVE Database

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Authoritative record:CVE-2026-123274· High

Not known to be exploited : upgrade to 5.3.1 soon.

Data as of 13 Nov 2026, 13:18 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 5.3.1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade apache/datasketches-cpp to 5.3.1.

Affected software

ProductAffectedFixed in
GitHubapache/datasketches-cpppkg:github/apache/datasketches-cppOther threatsAffected
  • >=2.0.0 <5.3.1
Fixed in
  • 5.3.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade Apache DataSketches C++ to version 5.3.1 or later, where this vulnerability is fixed. No other mitigation is indicated.

Description

An out-of-bounds write vulnerability exists in Apache DataSketches C++ versions 2.0.0 through 5.3.0. This flaw occurs when an application deserializes a KLL sketch from an untrusted source without validating the serialized level boundaries, potentially leading to heap memory corruption. The issue is fixed in version 5.3.1.

References

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