Vulnerability in Apple Swift-Nio-Http2
CVE-2026-64785
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.
Vulnerability class: HTTP Request Smuggling
EPSS: 0.002 (7.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Apple Swift-nio-http2 — versions 0
- Apple Swiftnio_http\/2
Weakness classification (CWE)
References
- product-security@apple.com (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-64785?
- CVE-2026-64785 is a medium-severity vulnerability in Apple Swift-Nio-Http2, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2026-07-23.
- How severe is CVE-2026-64785?
- Medium severity. CVSS v3 base score is 5.3 out of 10.