Technology · X.Org Foundation
X.Org Foundation X.Org Server vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 10 vulnerabilities in X.Org Foundation X.Org Server: 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-88812, was published on 27 October 2026. 1 vulnerability in the last four weeks, up from none in the four before.
- Last 7 days
- 0
- Last 90 days
- 1
- Critical, all time
- 1
- Exploited in the wild
- 0
About X.Org Foundation X.Org Server
The X.Org Server is the free and open-source implementation of the X Window System display server.
Latest X.Org Foundation X.Org Server vulnerabilities
- CVE-2026-88812: X.Org X Server double free in XKB SetGeometryhighCVSS 7.8
- CVE-2026-50264: X.Org X server and Xwayland out-of-bounds write in DRI2highCVSS 7.8
- CVE-2026-50261: X.Org X server use-after-free in SyncChangeCounterhighCVSS 7.8
- CVE-2026-50260: X.Org X server and Xwayland use-after-free in FreeCounterhighCVSS 7.8
- CVE-2026-50259: X.Org X server stack buffer overflow in XKB SetMap requesthighCVSS 7.8
- CVE-2026-34003: X.Org X server out-of-bounds memory access in XKB request validationhighCVSS 7.8EPSS 0.0%
- CVE-2026-34001: X.Org X server use-after-free in miSyncTriggerFencehighCVSS 7.8EPSS 0.0%
- CVE-2026-33999: X.Org X server integer underflow in XKB compatibility map handlinghighCVSS 7.8EPSS 0.0%
- CVE-2025-62230: X.Org X server use-after-free in Xkb client resource removalhighCVSS 7.3EPSS 0.3%
- CVE-1999-0526: X.Org X Server access control bypass via insecure xhost configurationcriticalCVSS 10
Most severe X.Org Foundation X.Org Server vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-1999-0526: X.Org X Server access control bypass via insecure xhost configurationcriticalCVSS 10
- CVE-2026-34003: X.Org X server out-of-bounds memory access in XKB request validationhighCVSS 7.8EPSS 0.0%
- CVE-2026-34001: X.Org X server use-after-free in miSyncTriggerFencehighCVSS 7.8EPSS 0.0%
- CVE-2026-33999: X.Org X server integer underflow in XKB compatibility map handlinghighCVSS 7.8EPSS 0.0%
- CVE-2026-88812: X.Org X Server double free in XKB SetGeometryhighCVSS 7.8
- CVE-2026-50264: X.Org X server and Xwayland out-of-bounds write in DRI2highCVSS 7.8
- CVE-2026-50261: X.Org X server use-after-free in SyncChangeCounterhighCVSS 7.8
- CVE-2026-50260: X.Org X server and Xwayland use-after-free in FreeCounterhighCVSS 7.8
- CVE-2026-50259: X.Org X server stack buffer overflow in XKB SetMap requesthighCVSS 7.8
- CVE-2025-62230: X.Org X server use-after-free in Xkb client resource removalhighCVSS 7.3EPSS 0.3%
Vulnerabilities per week
1 vulnerability in the last four weeks, up from none in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 1 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many X.Org Foundation X.Org Server vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/x-server)<a href="https://junglewise.ai/threats/technologies/x-server"><img src="https://junglewise.ai/threats/technologies/x-server/badge.svg" alt="X.Org Foundation X.Org Server vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/x-server.json, and this page as text at https://junglewise.ai/threats/technologies/x-server.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "X.Org Foundation X.Org Server vulnerabilities", https://junglewise.ai/threats/technologies/x-server, 9 November 2026.