CVE-2026-64785CWE-444

CVE-2026-64785

Medium · published July 24, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
20.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00289 · 20.3th percentile
Weakness
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Published
2026-07-24T00:17Z
Affected products (1)
ProductVersionsFixed in
apple/swiftnio_http\/2< 1.45.01.45.0
References (1)
https://github.com/apple/swift-nio-http2/security/advisories/GHSA-q3g2-m552-3r9c · [email protected]
EPSS history
Timeline
  • 23 JUL 18:50Z
    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…
    cvelistv5