CVE-2026-11836
Production Debug-Unlock Token Verification Missing Device Binding
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.
INFO
Published Date :
Aug. 4, 2026, 12:16 a.m.
Last Modified :
Aug. 4, 2026, 12:16 a.m.
Remotely Exploit :
No
Source :
b01ddd03-5ef6-483b-b2c5-acba77f1a554
Affected Products
The following products are affected by CVE-2026-11836
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | LOW | b01ddd03-5ef6-483b-b2c5-acba77f1a554 | ||||
| CVSS 4.0 | LOW | b01ddd03-5ef6-483b-b2c5-acba77f1a554 |
Solution
- Update Caliptra Core ROM and Core Firmware.
- Verify debug unlock token authenticity and scope.
- Ensure unique tokens for each device.
- Restrict access to debug unlock signing service.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-11836.
| URL | Resource |
|---|---|
| https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-11836 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-11836
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-11836 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-11836 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by b01ddd03-5ef6-483b-b2c5-acba77f1a554
Aug. 04, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Caliptra', 'modules': ['validate_debug_unlock_token()'], 'product': 'Core ROM', 'versions': [{'status': 'affected', 'version': '2.0.0', 'versionType': 'semver', 'lessThanOrEqual': '2.0.2'}, {'status': 'unaffected', 'version': '2.0.3', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.1.0', 'versionType': 'semver', 'lessThanOrEqual': '2.1.1'}, {'status': 'unaffected', 'version': '2.1.2', 'versionType': 'semver'}], 'packageName': 'Core ROM', 'collectionURL': 'https://github.com/chipsalliance/caliptra-sw', 'defaultStatus': 'unaffected'}, {'vendor': 'Caliptra', 'modules': ['validate_debug_unlock_token()'], 'product': 'Core Firmware', 'versions': [{'status': 'affected', 'version': '2.0.0', 'versionType': 'semver', 'lessThanOrEqual': '2.0.1'}, {'status': 'unaffected', 'version': '2.0.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.1.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '2.1.1', 'versionType': 'semver'}], 'packageName': 'Core Firmware', 'collectionURL': 'https://github.com/chipsalliance/caliptra-sw', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-345 Added Reference https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376