CVE-2026-43820
HighCVSS 7.7Exploitation Probability (EPSS)
Low risk0th percentile - higher than 0% of all known CVEs
Summary
In swift-nio-ssl, the NIOSSLCertificate._subjectAlternativeNames method provides access to raw bytes for a cert's SANs. It assumes the buffer is backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, leading to potential out-of-bounds memory access.
Risk Assessment
The risk is out-of-bounds memory access, which could lead to disclosure of sensitive data or crashes.
Recommendation
Upgrade swift-nio-ssl to version 2.37.2, which fixes the vulnerability.
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Original NVD description (English source)
NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access. This vulnerability is addressed in swift-nio-ssl version 2.37.2.