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CVE-2026-23555

7.1 · HIGH

Any guest issuing a Xenstore command accessing a node using the (illegal) node path "/local/domain/", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path.

Published Mar 23, 2026CWE-617EPSS 0.18%

Overview

CVE-2026-23555 is a high-severity vulnerability. It was published on March 23, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

Any guest issuing a Xenstore command accessing a node using the

(illegal) node path "/local/domain/", will crash xenstored due to a

clobbered error indicator in xenstored when verifying the node path.

Note that the crash is forced via a failing assert() statement in

xenstored. In case xenstored is being built with NDEBUG #defined,

an unprivileged guest trying to access the node path "/local/domain/"

will result in it no longer being serviced by xenstored, other guests

(including dom0) will still be serviced, but xenstored will use up

all cpu time it can get.

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-481.htmlRefwww.openwall.com/lists/oss-security/2026/03/17/7Refxenbits.xen.org/xsa/advisory-481.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23555?

CVE-2026-23555 is a high-severity vulnerability. It was published on March 23, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-23555?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-23555?

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-2026-23555?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23555 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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