VULNERABILITY INTELLIGENCE

CVE-2026-64785

CVSS score5.3 MEDIUM
EPSS probability0.29%
CISA KEVNot currently listed
Published2026-07-23
Last modified2026-10-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Description

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-444

Primary references