CVE-2026-20753 Integer overflow in Slim Bootloader may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.
An integer overflow in Slim Bootloader UEFI firmware allows privileged local attackers to execute arbitrary code and escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20753?
CVE-2026-20753 is a high-severity vulnerability in Slim Bootloader may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts., published on 12 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Integer overflow in the UEFI firmware for the Slim Bootloader may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable local code execution. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (high), integrity (high) and availability (high) impacts.
Weakness: CWE-190
Which versions are affected by CVE-2026-20753?
How do I fix CVE-2026-20753?
No fix has been published for CVE-2026-20753 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20753 being exploited?
There is no known exploitation of CVE-2026-20753 in the wild and no public exploit code.
Sources
Also known as GHSA-q695-vc4p-4hjx.