CVE-2026-56000
An attacker can exploit multiple vulnerabilities in X.Org X11 and Xwayland to cause a denial of service or potentially execute arbitrary program code.
CSIRTS triage
- What
- Multiple vulnerabilities allow an attacker to cause denial of service or execute arbitrary code.
- Who is affected
- Deployments of X.Org X11 and Xwayland are affected.
- Urgency
- Remediation is urgent due to the high severity and potential for exploitation.
- Action
- Apply available patches for X.Org X11 and Xwayland.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Advisory coverage (3)
- high[NEW] [high] X.Org X11 and Xwayland: Multiple vulnerabilities allow code execution and DoScert-bund · 2026-07-09
- highCVE-2026-56000: Local attackers with a X connection able to provide GLX commit to the X server xorg-server bef…nvd · 2026-07-08
- unknownCVE-2026-56000: xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()msrc · 2026-07-02
External references
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[](https://www.csirts.com/cve/CVE-2026-56000)