Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M
CVE-2026-119344Cocos Intra-handshake attested TLS implementation is vulnerable to Diversion Attacks
Critical 9.1
In plain English
A critical-severity security flaw in cocos from ultravioletrs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official description
Cocos AI is a confidential computing system for AI. In version 0.8.2 and earlier, Cocos AI accepts trusted execution environment attestation Evidence when firmware patch levels and software measurements match, without binding the Evidence to an allowed platform owner or unique machine identity and without enforcing revocation. A remote attacker who controls or compromises another platform trusted by the same verifier can substitute valid Evidence from that platform and cause authorization of the wrong platform. This vulnerability is addressed in 0.9.0. However, this vulnerability can't be patched in source code alone, since the vulnerability arises from the confidential computing threat model itself.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ultravioletrs | cocos | <= 0.8.2 |
Weakness: CWE-346 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/ultravioletrs/cocos/security/advisories/GHSA-v5m8-5wxc-vjgp x_refsource_CONFIRM
- https://dl.acm.org/doi/10.1145/3779208.3785387 x_refsource_MISC
- https://doi.org/10.1145/3779208.3785387 x_refsource_MISC
- https://github.com/ultravioletrs/cocos/releases/tag/v0.9.0 x_refsource_MISC
- https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/platform-ownership-endorsements.html x_refsource_MISC