Distribution advisory
This page covers CVE-2026-56000 as tracked by Debian, for the package xorg-server. The fix is available in version 2:21.1.24-1; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Attack vector: Local — a local account, shell or session on the host is needed.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: Low — an ordinary user account is enough.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: High — total loss, or loss the attacker controls.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: High — total loss, or loss the attacker controls.
Weakness class
DEBIAN-CVE-2026-56000 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.
Affected software
DEBIAN-CVE-2026-56000 is recorded against 2 packages.
- xorg-server (fixed in 2:21.1.24-1)
- xwayland (fixed in 2:24.1.13-1)
Timeline and source
Published on 8 July 2026 and last revised on 11 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
security-tracker.debian.org (Advisory)
Other advisories for this package
xorg-server has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-416: Use After Free) in other software:
