CVE-2026-64785

MEDIUM

swift-nio-http2 <1.45.0: HTTP request smuggling & response splitting via unvalidated HEADERS frame chars

Title source: llm

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.

References (1)

Core 1

Core References

https://github.com/apple/swift-nio-http2/security/advisories/GHSA-q3g2-m552-3r9c

Scores

CVSS v3 5.3

EPSS 0.0018

EPSS Percentile 7.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-444

Status published

Products (2)

Apple/swift-nio-http2 < 1.45.0

SwiftURL/swift-nio-http2 0 - 1.45.0SwiftURL

Published Jul 23, 2026

Tracked Since Jul 24, 2026