Out-of-bounds Read Affecting github.com/apple/swift-nio-ssl package, versions >=2.18.0 <2.37.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-SWIFT-APPLESWIFTNIOSSL-18302530
- published25 Jul 2026
- disclosed23 Jul 2026
- creditUnknown
Introduced: 23 Jul 2026
NewCVE-2026-43820 (opens in a new tab)How to fix?
Upgrade apple/swift-nio-ssl to version 2.37.2 or higher.
Overview
apple/swift-nio-ssl is a TLS Support for SwiftNIO, based on BoringSSL.
Affected versions of this package are vulnerable to Out-of-bounds Read due to improper handling of the NIOSSLCertificate._subjectAlternativeNames process. An attacker can cause out-of-bounds memory access by accessing the buffer for a subject alternative name type that is not backed by an ASN1_STRING.