CVE-2026-11836: Caliptra Core Firmware

Low severity, CVSS 1.8. EPSS: 0.1% chance of exploitation in the next 30 days.

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

• Caliptra Core Firmware: from 2.0.0, up to and including 2.0.1; version 2.1.0 only
• Caliptra Core Rom: from 2.0.0, up to and including 2.0.2; from 2.1.0, up to and including 2.1.1

Published 2026-08-04. Last modified 2026-09-03.