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Vulnerability record · CVE-2026-42493 · published 28 July 2026

CVE-2026-42493: Uncontrolled resource consumption vulnerability

Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk. Memory-wise small enough guests may still be okay to run.

7.5 CVSS 3.1 High EPSS 0.61% · top 53.0% CWE-400 · Uncontrolled resource consumption Deferred
7.5CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
28 Jul 2026Last modified by NVD

Description

Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk. Memory-wise small enough guests may still be okay to run.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://xenbits.xenproject.org/xsa/advisory-495.html
http://www.openwall.com/lists/oss-security/2026/07/28/12
http://xenbits.xen.org/xsa/advisory-495.html

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Source: NIST National Vulnerability Database (record CVE-2026-42493), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.