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Vulnerability record · CVE-2026-32253 · published 22 May 2026

CVE-2026-32253: Lizardbyte sunshine improper authentication vulnerability

Lizardbyte · Sunshine

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.

9.8 CVSS 3.1 Critical EPSS 0.43% · top 65.3% CWE-287 · Improper authenticationCWE-295 · Improper certificate validation
9.8CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
23 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/LizardByte/Sunshine/releases/tag/v2026.516.143833 ProductRelease Notes
https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 ExploitVendor Advisory
https://github.com/LizardByte/Sunshine/security/advisories/GHSA-ph75-mgxh-mv57 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-32253), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.