What’s Vulnerable › Vulnerabilities
CVE-2026-64785
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-23 · updated 2026-10-24
- Weakness: CWE-444
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.
Affected products
- Swift Project SwiftNIO HTTP2: before 1.45.0 — fixed in 1.45.0
How to fix
Upgrade to a fixed version: Swift Project SwiftNIO HTTP2 1.45.0. Check the vendor advisory for mitigations.
References
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