CVE-2026-28898

swift-nio-http2's HTTP/2-to-HTTP/1.1 codec did not validate pseudo-header values for control characters before placing them into the translated HTTP/1.1 message. swift-nio-http2 1.44.1 adds validation of all pseudo-header values (:path, :authority, :scheme, :method, and :status) at both the HPACK header validation layer and the HTTP/2-to-HTTP/1.1 translation layer. Requests or responses containing CR, LF, or NUL bytes in any pseudo-header value are now rejected with a connection error. This issue is fixed in swift-nio-http2 1.44.1.

Score

CVSS 3.1 5.3 Medium

Status

Analyzed - product-security@apple.com

Published

2026-06-25

Last modified

2026-10-25

Weaknesses

CWE-116

Affected products

• Swift-nio-http2 (Apple)
• Swiftnio Http/2 (Apple)

References

• https://github.com/advisories/GHSA-4px2-pw77-vc85