CVE-2026-32253

Name: CVE-2026-32253
Creator: NVD / NIST
Published: 2026-05-22T17:16:46.393+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2026-32253 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

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 verify callback treats X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY, X509_V_ERR_CERT_NOT_YET_VALID, and X509_V_ERR_CERT_HAS_EXPIRED as success. This can allow an untrusted certificate to pass authentication and access protected HTTPS endpoints. This issue has been fixed in version 2026.516.143833.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.29%

20.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Lizardbyte	Sunshine	< 2026.516.143833

References

https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833Product, Release Notes
https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57Exploit, Vendor Advisory
https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57Exploit, Vendor Advisory

Timeline

Published: May 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-32253?

How severe is CVE-2026-32253?

CVE-2026-32253 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2026-32253?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-32253?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST