CVE-2026-11836 Production Debug-Unlock Token Verification Missing Device Binding
An attacker with access to the signing service can unlock debug on unintended devices sharing a key hash, bypassing per-device scope enforcement.
- 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-2026-11836?
CVE-2026-11836 is a low-severity vulnerability in Caliptra Core Firmware, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Insufficient verification of data authenticity in Caliptra Core ROM and Core Firmware (validate_debug_unlock_token()) in subsystem mode allows an attacker with access to the integrator's debug unlock signing service to unlock production debug on an unintended device by presenting a valid token issued for a different device sharing the same debug unlock key hash. The 384-bit challenge nonce continues to prevent replay of previously issued tokens. Practical impact is limited to loss of per-device scope enforcement within a set of devices that share the same unlock authority by design; it does not enable debug unlock on devices outside that set.
This issue affects Core ROM: 2.0.0 through 2.0.2, 2.1.0 through 2.1.1; Core Firmware: 2.0.0 through 2.0.1, 2.1.0.
Weakness: CWE-345
Which versions are affected by CVE-2026-11836?
How do I fix CVE-2026-11836?
No fix has been published for CVE-2026-11836 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11836 being exploited?
There is no known exploitation of CVE-2026-11836 in the wild and no public exploit code.
Sources
Also known as GHSA-hw68-jjx4-m376.