CVE-2026-42581
critical
CVSS v3
9.8
CVSS v2
—
VIR risk
9.8
Description
Netty HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
Predictions
Exploit likelihood
97%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-42581
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-42581.html
Vendor advisory: security-advisories@github.com — https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | io.netty:netty-codec-http | >=4.2.0.Alpha1,<4.2.13.Final | 4.2.13.Final |
| Maven | io.netty:netty-codec-http | <4.1.133.Final | 4.1.133.Final |
| MAVEN | io.netty:netty-codec-http | <= 4.1.132.Final | 4.1.133.Final |
| MAVEN | io.netty:netty-codec-http | >= 4.2.0.Alpha1, <= 4.2.12.Final | 4.2.13.Final |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| netty | netty | {"endExcluding":"4.1.133"} | 4.1.133 |
References
- https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9
- https://nvd.nist.gov/vuln/detail/CVE-2026-42581
- https://github.com/netty/netty
- https://www.suse.com/security/cve/CVE-2026-42581.html
- https://security-tracker.debian.org/tracker/CVE-2026-42581
- https://github.com/advisories/GHSA-xxqh-mfjm-7mv9
CWEs
CWE-444
Verify integrity in audit chain (admin only). AS-IS.