CVE-2026-33583: Arqit SKA-Platform Vulnerable to Key Exposure

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-13 · updated 2026-10-26
Weakness: CWE-749

Description

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 Symmetric Key Agreement Platform: before 26.03.

Affected products

Arqit Symmetric Key Agreement Platform: before 26.03 — fixed in 26.03

How to fix

Upgrade to a fixed version: Arqit Symmetric Key Agreement Platform 26.03. Check the vendor advisory for mitigations.

References

https://www.cvcn.gov.it/cvcn/cve/CVE-2026-33583

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