CVE catalog
CVE-2026-42578
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicit
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.06% · Oct 25, 2026
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.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 | vulnerable |
| Debian | netty | forky | 1:4.1.48-16 | vulnerable |
| Debian | netty | trixie | 1:4.1.48-10+deb13u1 | vulnerable |
| Debian | netty | trixie-security | 1:4.1.48-10+deb13u1 | vulnerable |
| Debian | netty | bookworm | 1:4.1.48-7+deb12u2 | vulnerable |
| Debian | netty | bookworm-security | 1:4.1.48-7+deb12u2 | vulnerable |
| Cpe | netty | Not reported | 1:4.1.48-9ubuntu0.1+esm3 | fixed |
| Cpe | libnetty-java | Not reported | 1:4.1.48-9ubuntu0.1+esm3 | fixed |
| Cpe | netty | Not reported | Not reported | vulnerable |
| Cpe | netty | Not reported | 4.1.133 | fixed |
| Cpe | netty | Not reported | 4.2.13 | fixed |
| Cpe | netty | Not reported | 4.2.13 | fixed |
| Ubuntu | netty | pro | 1:4.1.48-10 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.48-11 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.48-12 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.48-13 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.48-14 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.48-16 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.48-16ubuntu0.1~esm2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | netty | source | sid | (unfixed) | not yet assigned | Not reported | [1139914] |
| Debian | netty | source | forky | (unfixed) | not yet assigned | Not reported | [1139914] |
| Debian | netty | source | trixie | (unfixed) | not yet assigned | Not reported | [1139914] |
| Debian | netty | source | bookworm | (unfixed) | not yet assigned | Not reported | [1139914] |
| Cpe | netty | cpe | Not reported | 1:4.1.48-9ubuntu0.1+esm3 | Not reported | Not reported | Not reported |
| Cpe | libnetty-java | cpe | Not reported | 1:4.1.48-9ubuntu0.1+esm3 | Not reported | Not reported | Not reported |
| Cpe | netty | cpe | Not reported | 4.1.133 | Not reported | Not reported | Not reported |
| Cpe | netty | cpe | Not reported | 4.2.13 | Not reported | Not reported | Not reported |
| Cpe | netty | cpe | Not reported | 4.2.13 | Not reported | NVD-CVE-2026-42578 | Not reported |
| Ubuntu | netty | deb | pro | 1:4.1.48-16ubuntu0.1~esm2 | Not reported | USN-8401-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libnetty-java]Affected
Source package: [netty]
Details (4)
1:4.1.48-7+deb12u2· all · bookwormAffected
nvd · netty · debian · bookworm; nvd · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookwormAffected
nvd · netty · debian · bookworm; nvd · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookworm-securityAffected
nvd · netty · debian · bookworm; nvd · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookworm-securityAffected
nvd · netty · debian · bookworm; nvd · netty · debian · 12
[Debian 13 (Trixie)]
- [libnetty-java]Affected
Source package: [netty]
Details (4)
1:4.1.48-10+deb13u1· all · trixieAffected
nvd · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixieAffected
nvd · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixie-securityAffected
nvd · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixie-securityAffected
nvd · netty · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10795-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-42578]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-42578]
- [https://osv.dev/vulnerability/USN-8401-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-42578]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42578.json]
- [https://ubuntu.com/security/notices/USN-8401-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1372.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]