CVE catalog
CVE-2026-100659
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 head
- Severity
- Medium · CVSS 6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.24% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | netty | sid | 1:4.1.48-16 | not affected |
| Debian | netty | forky | 1:4.1.48-16 | not affected |
| Debian | netty | trixie | 1:4.1.48-10+deb13u1 | not affected |
| Debian | netty | trixie-security | 1:4.1.48-10+deb13u1 | not affected |
| Debian | netty | bookworm | 1:4.1.48-7+deb12u2 | not affected |
| Debian | netty | bookworm-security | 1:4.1.48-7+deb12u2 | not affected |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | netty | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | netty | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | netty | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | netty | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libnetty-java]Not affected
Source package: [netty]
Details (4)
1:4.1.48-7+deb12u2· all · bookwormNot affected
nvd · netty · debian · bookworm
1:4.1.48-7+deb12u2· all · bookwormNot affected
nvd · netty · debian · bookworm
1:4.1.48-7+deb12u2· all · bookworm-securityNot affected
nvd · netty · debian · bookworm
1:4.1.48-7+deb12u2· all · bookworm-securityNot affected
nvd · netty · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-100659]
- [https://security-tracker.debian.org/tracker/CVE-2026-100659]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100659.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3291.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]