Skip to main content
VulnerabilityPublished

CVE-2026-33697: ultravioletrs cocos · Key Exchange Without Entity Authentication

Affects ultravioletrs cocosSource CVE Database V5

0
Compare

Not known to be exploited · CVSS 7.5 High : upgrade to 0.8.2 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
ultravioletrscocosAffected
  • >=0.4.0 <0.8.2
Fixed in
  • 0.8.2

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.

References

Community reviews

Loading reviews…