CVE catalog
CVE-2026-42585
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks.
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.27% · Oct 25, 2026
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. 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 |
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-2026-42585 | 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://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-42585]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-42585]
- [https://security-tracker.debian.org/tracker/CVE-2026-42585]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42585.json]
- [https://ubuntu.com/security/notices/USN-8401-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1955.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)]