Apple Swift Nio Http2 vulnerabilities

2 vulnerabilities

Known vulnerabilities in Apple Swift Nio Http2, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

5.3CVE-2026-64785appleswift-nio-http2+1
EPSS score
0.29%
SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control characters reach an HTTP/1.1 backend through NIOHTTP2's HTTP/2-to-HTTP/1 codec, enabling HTTP request smuggling or response splitting. This vulnerability is addressed in swift-nio-http2 version 1.45.0.5.3CVE-2026-28898appleswift-nio-http2+1
EPSS score
0.31%
swift-nio-http2's HTTP/2-to-HTTP/1.1 codec did not validate pseudo-header values for control characters before placing them into the translated HTTP/1.1 message. swift-nio-http2 1.44.1 adds validation of all pseudo-header values (:path, :authority, :scheme, :method, and :status) at both the HPACK header validation layer and the HTTP/2-to-HTTP/1.1 translation layer. Requests or responses containing CR, LF, or NUL bytes in any pseudo-header value are now rejected with a connection error. This issue is fixed in swift-nio-http2 1.44.1.