What is CVE-2026-32253?

CVE-2026-32253 is a critical-severity vulnerability in Lizardbyte Sunshine, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-05-22.

How severe is CVE-2026-32253?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Lizardbyte Sunshine

CVE-2026-32253

Sunshine is a self-hosted game stream host for Moonlight. In versions prior to 2026.516.143833, the client-certificate authentication can be bypassed because of how OpenSSL verification results are handled. In src/crypto.cpp, the custom ve…

Vulnerability class: Broken Authentication

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Lizardbyte Sunshine — versions < 2026.516.143833

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-32253?: CVE-2026-32253 is a critical-severity vulnerability in Lizardbyte Sunshine, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-05-22.
How severe is CVE-2026-32253?: Critical severity. CVSS v3 base score is 9.8 out of 10.