# CVE-2026-62434 — Xen

> As of 2026-07-28, CVE-2026-62434 is a MEDIUM-severity vulnerability in Xen, CVSS v3.1 5.3, EPSS 0.3% (29.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-62434, most recently “Multiple Vulnerabilities in Citrix XenServer 8.4 and 9 Enable Guest-to-Host Escalation and Denial of Service (CVE-2026-42492, CVE-2026-62428, CVE-2026-62431, CVE-2026-62432, CVE-2026-62434, CVE-2026-62435, CVE-2026-62436)”.

**Last updated:** 2026-07-28

## What is CVE-2026-62434?

A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest RAM. This can cause corruption of memory management state in Xen.

The record classifies CVE-2026-62434 under weakness class [CWE-787](https://intel.threadlinqs.com/cwe/CWE-787). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 84 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 29.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-28

## Is CVE-2026-62434 being exploited?

It currently carries a trending score of 24 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Xen](https://intel.threadlinqs.com/vendors/xen): Xen

## How to fix CVE-2026-62434

No vendor patch reference has been recorded for CVE-2026-62434 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-62434

1 tracked threat in the Threadlinqs corpus references CVE-2026-62434, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Multiple Vulnerabilities in Citrix XenServer 8.4 and 9 Enable Guest-to-Host Escalation and Denial of Service (CVE-2026-42492, CVE-2026-62428, CVE-2026-62431, CVE-2026-62432, CVE-2026-62434, CVE-2026-62435, CVE-2026-62436)](https://intel.threadlinqs.com/threat/TL-2026-1781) — HIGH · 2026-07-31

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [xenbits.xenproject.org](https://xenbits.xenproject.org/xsa/advisory-507.html)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-62434
Full detection coverage and IOCs for threats exploiting CVE-2026-62434 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp