CVE-2026-32253
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
In Sunshine, a self-hosted game stream host for Moonlight, versions prior to 2026.516.143833, client-certificate authentication can be bypassed due to how OpenSSL verification results are handled. The custom verify callback treats some errors as success, allowing untrusted certificates.
Risk Assessment
An unauthenticated attacker can access protected HTTPS endpoints, potentially leading to system compromise.
Recommendation
Upgrade Sunshine to version 2026.516.143833 or later.
Original NVD description (English source)
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.