CVE-2026-33697: ultravioletrs cocos · Key Exchange Without Entity Authentication
Affects ultravioletrs cocosSource CVE Database V5
Not known to be exploited · CVSS 7.5 High : upgrade to 0.8.2 soon.
Data as of 30 Oct 2026, 06:59 UTC
- EPSS
- 0.08% chance of exploitation in 30 days – higher than 0% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.8.2
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade ultravioletrs cocos to 0.8.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| ultravioletrscocos | Affected
| Fixed in
|
AI-suggested
To reduce risk, it is recommended to keep TEE firmware and microcode up to date to minimize key-extraction attack surfaces; enforce strict attestation policies validating all report fields including firmware versions, TCB levels, and platform configuration registers; and enable mutual attested TLS with CA-signed certificates where the deployment architecture allows. These measures reduce but do not eliminate the risk.
Description
CVE-2026-33697 is a high-severity vulnerability in the attested TLS (aTLS) implementation of the CoCoS confidential computing system for AI, affecting versions 0.4.0 through 0.8.2. The vulnerability allows a relay attack due to the extraction of the ephemeral TLS private key during the intra-handshake attestation. This key extraction enables an attacker to impersonate an attested CoCoS service, undermining authentication guarantees and potentially exposing sensitive data or operations. Exploitation requires physical access or advanced side-channel or transient execution attacks. The vulnerability is architectural and affects both AMD SEV-SNP and Intel TDX deployments.