PatchTheCVECVE-2026-93517: A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server be
CVE-2026-93517 is a high-severity flaw (CVSS 8.5) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.5 (High) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | n/a |
| CISA exploited list | No |
| Weakness | CWE-122 |
| Published | 2026-10-28 |
| Last modified | 2026-10-28 |
Last updated 2026-10-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Official advisories
- Amazon Linux 2023 ALAS: ALAS2023-2026-3260 (important): xorg-x11-server 2026-10-24
- Amazon Linux 2023 ALAS: ALAS2023-2026-3261 (important): xorg-x11-server-Xwayland 2026-10-24
- Amazon Linux 2023 ALAS: ALAS2023-2026-3262 (important): tigervnc 2026-10-24
- Amazon Linux 2 ALAS: ALAS2-2026-4013 (important): tigervnc 2026-10-24
- Amazon Linux 2 ALAS: ALAS2-2026-4014 (important): xorg-x11-server 2026-10-24
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-93517?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-93517 being exploited?
CVE-2026-93517 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-93517 affect?
CVE-2026-93517 affects affected software. Severity is high (CVSS 8.5). A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execu
How urgent is CVE-2026-93517?
Priority 30/100. High severity