Bug 2506497 (CVE-2026-43820) - CVE-2026-43820 swift-nio-ssl: swift-nio-ssl: Out-of-bounds memory access due to improper handling of Subject Alternative Names
Summary: CVE-2026-43820 swift-nio-ssl: swift-nio-ssl: Out-of-bounds memory access due ...
Keywords:
Status: NEW
Alias: CVE-2026-43820
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-23 15:02 UTC by OSIDB Bzimport
Modified: 2026-08-24 11:55 UTC (History)
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Description OSIDB Bzimport 2026-07-23 15:02:14 UTC 
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.
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