swiftnio ssl vulnerabilities and fixes

Recent CVEs affecting swiftnio ssl, with upgrade or downgrade steps. 1 tracked.

Also searched as: swiftniossl.

swiftnio ssl has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 1. Most recent: 2026-07-23. Highest priority: CVE-2026-43820 (score 32/100).

• CVE-2026-43820 HIGH 7.7 UPGRADE NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs

FAQ

How do I fix swiftnio ssl vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is swiftnio ssl being exploited right now?

None of the tracked swiftnio ssl CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which swiftnio ssl CVE should I patch first?

CVE-2026-43820 currently ranks highest (32/100): NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs.

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