CVE Catalog

CVE-2026-64785

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.29%

20th percentile - higher than 20% of all known CVEs

Summary

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.

Risk Assessment

Attackers can manipulate HTTP requests, potentially leading to session hijacking, cache poisoning, or bypassing security controls.

Recommendation

Update the swift-nio-http2 library to version 1.45.0 or later.

Related vulnerabilities

Original NVD description (English source)

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 data from NVD (NIST) · CISA KEV · EPSS