What is CVE-2026-33583?

CVE-2026-33583 is a high-severity vulnerability in Arqit Symmetric Key Agreement Platform, classified under CWE-749. CVSS score: 8.7/10. Published 2026-05-13.

How severe is CVE-2026-33583?

High severity. CVSS v3 base score is 8.7 out of 10.

Vulnerability in Arqit Symmetric Key Agreement Platform

CVE-2026-33583

Exposure of the QKEY (used as input into the ‘OTA-Quantum’ device registration process) and internal system keys via an unauthenticated and unencrypted HTTP GET method in the Arqit Symmetric Key Agreement Platform. This issue affects Sy…

EPSS: 0.000 (12.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

Affected products

Arqit Symmetric Key Agreement Platform — versions 0

Weakness classification (CWE)

CWE-749

References

a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (third-party-advisory)

Frequently asked questions

What is CVE-2026-33583?: CVE-2026-33583 is a high-severity vulnerability in Arqit Symmetric Key Agreement Platform, classified under CWE-749. CVSS score: 8.7/10. Published 2026-05-13.
How severe is CVE-2026-33583?: High severity. CVSS v3 base score is 8.7 out of 10.