[UPDATE] [medium] X.Org X11, Xwayland: Multiple vulnerabilities
A local attacker can exploit multiple vulnerabilities in X.Org X11 and Xwayland to carry out unspecified attacks, potentially including memory corruption, information disclosure, or a denial-of-service condition.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited by a local attacker to carry out unspecified attacks, potentially including memory corruption, information disclosure, or Denial of Service.
- Who is affected
- Local users of X.Org X11 and Xwayland.
- Urgency
- Remediation is important due to the potential for various attacks, although exploitation has not been reported.
- Action
- Update to the latest version of X.Org X11 and Xwayland.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch X11, Xwayland
Get an email when a new X11, Xwayland advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1119
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-339990.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.
- Low exploitation riskCVE-2026-340000.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.
- Low exploitation riskCVE-2026-340010.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.
- Low exploitation riskCVE-2026-340020.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.
- Low exploitation riskCVE-2026-340030.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-33999 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34000 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34001 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34002 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-34003 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for X.Org X11, Xwayland
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [high] Xwayland and X.Org X11: Multiple vulnerabilities allow unspecified attackcert-bund · 2026-07-09
- medium[UPDATE] [medium] X.Org X11 and Xwayland: Multiple vulnerabilitiescert-bund · 2026-07-09
- medium[UPDATE] [medium] X.Org X11 and Xwayland: Multiple vulnerabilitiescert-bund · 2026-07-09
- high[NEW] [high] X.Org X11 and Xwayland: Multiple vulnerabilities allow code execution and DoScert-bund · 2026-07-09
More from CERT-Bund (BSI) Security Advisories
- medium[NEW] [medium] DENX U-Boot: Multiple vulnerabilities allow execution of arbitrary code and DoS2026-07-10
- medium[NEW] [medium] Samsung Android: Multiple vulnerabilities2026-07-10
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-10
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attack2026-07-10
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-10