CVE record · CVE-2026-103636

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

CVSS 7.5 HighEPSS 0.0038 · 32nd percentile

Published by the CVE Program (CNA: apache) at 10 Oct 2026, 10:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Apache Software Foundation	Apache DataSketches Package name: apache/datasketches-cpp https://github.com pkg:github/apache/datasketches-cpp	affected 2.0.0-incubating to 5.2.0, inclusive semver Other versions: unaffected

Identifiers: CVE-2026-103636
CNA: apache
Weakness (CWE): CWE-125 · CWE-191
Tags: Apache Software Foundation Apache DataSketches
Memory corruption
Published: 10 Oct 2026
Updated: 16 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	ADP (CISA-ADP)

CISA KEV Not listed.
EPSS 0.0038, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 10 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

lists.apache.org/thread/znn94s463w7wy125khcywxsp82y2qkq5 vendor-advisory
github.com/apache/datasketches-cpp/releases/tag/5.3.0 release-notes

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.