Vulnerability · Published Aug 4, 2026 · Assigned by Caliptra
CVE-2026-11836Production Debug-Unlock Token Verification Missing Device Binding
Low 1.8
In plain English
A low-severity insufficient verification of data authenticity in Core Firmware from Caliptra. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Caliptra | Core ROM | 2.0.0 – through 2.0.22.1.0 – through 2.1.1 |
| Caliptra | Core Firmware | 2.0.0 – through 2.0.12.1.0 |
Weakness: CWE-345 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N