CVE-2026-32253: Sunshine is a self-hosted game stream host for Moonlight

Q: How do I fix CVE-2026-32253?

sunshine: upgrade to 2026.516.143833. Exact commands for each OS are on this page.

Q: Is CVE-2026-32253 being exploited?

CVE-2026-32253 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-32253 affect?

CVE-2026-32253 affects sunshine. Severity is critical (CVSS 9.8). 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 ver

Q: How urgent is CVE-2026-32253?

Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-32253 is a critical-severity flaw (CVSS 9.8) affecting sunshine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ac

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-287, CWE-295
Published	2026-05-22
Last modified	2026-07-23

Publisher (CNA): GitHub, Inc. · Vendor: lizardbyte

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-22 17:16 UTCPublished CVE record published
2026-07-23 16:10 UTCUpdated Record last modified

lizardbyte sunshine UPGRADE

Affected: < 2026.516.143833

Fixed in: 2026.516.143833

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sunshine || rpm -q sunshine || sunshine --version

2. UPGRADE to 2026.516.143833 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sunshine

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sunshine

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32253?

sunshine: upgrade to 2026.516.143833. Exact commands for each OS are on this page.

Is CVE-2026-32253 being exploited?

CVE-2026-32253 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32253 affect?

CVE-2026-32253 affects sunshine. Severity is critical (CVSS 9.8). 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 ver

How urgent is CVE-2026-32253?

Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

OpenSSL vulnerabilities

References

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