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CVE-2026-23557

6.5 · MEDIUM

Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES command within a transaction due to an assert() triggering.

Published May 19, 2026CWE-617EPSS 0.16%

Overview

CVE-2026-23557 is a medium-severity vulnerability. It was published on May 19, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Any guest can cause xenstored to crash by issuing a XS_RESET_WATCHES

command within a transaction due to an assert() triggering.

In case xenstored was built with NDEBUG #defined nothing bad will

happen, as assert() is doing nothing in this case. Note that the

default is not to define NDEBUG for xenstored builds even in release

builds of Xen.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refxenbits.xenproject.org/xsa/advisory-484.htmlRefwww.openwall.com/lists/oss-security/2026/04/28/11Refxenbits.xen.org/xsa/advisory-484.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23557?

CVE-2026-23557 is a medium-severity vulnerability. It was published on May 19, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-23557?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23557?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23557?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23557 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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