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CVE-2026-32253

Lizardbyte Sunshine authentication bypass

9.8 CRITICALPublic exploitEPSS 0.43%
  1. Published22 May 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Lizardbyte Sunshine< 2026.516.143833

Remediation

Fixed in
Lizardbyte Sunshine≥ 2026.516.143833

References

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Frequently asked

Is CVE-2026-32253 being actively exploited?

CVE-2026-32253 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.43%.

How severe is CVE-2026-32253?

CVE-2026-32253 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.43% probability of exploitation.

Which products are affected by CVE-2026-32253?

Affected products include Lizardbyte Sunshine.

How do I fix CVE-2026-32253?

Upgrade affected software to a fixed version, for example Lizardbyte Sunshine 2026.516.143833 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.