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CVE-2026-100659

Netty 4.2.0 through 4.2.17 HTTP/3 Request Routing Bypass PUBLISHED

Description (CNA)

Netty's HTTP/3 codec (io.netty:netty-codec-http3) in versions 4.2.0.Final through 4.2.17.Final does not enforce the RFC 9114 requirement that the :authority pseudo-header field and a literal host header field, when both present, carry the same value. A remote unauthenticated peer can send a single HEADERS frame containing both fields with differing, attacker-controlled values; the request is accepted and delivered to the application with two conflicting authorities, allowing routing, virtual-host, and access-control decisions to be bypassed when different components in the request path consult different fields. This issue is fixed in 4.2.18.Final.

Affected (CNA)

Vendor / productVersions
netty / nettyaffected 4.2.0.Final before 4.2.18.Final; unaffected 4.2.18.Final

CWE

CWE-444

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.