Distribution advisory
This page covers CVE-2026-42578 as tracked by Maven (Root.io), for the package netty-handler-proxy. The fix is available in version 4.1.126.Final-aikido.22; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability none.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: None.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: None.
Weakness class
ROOT-APP-MAVEN-CVE-2026-42578 is classified as CWE-113: HTTP Response Splitting. Unescaped input reaches an HTTP header, letting an attacker inject line breaks and forge additional headers or responses.
Affected software
ROOT-APP-MAVEN-CVE-2026-42578 is recorded against 2 packages.
- io.netty:netty-handler-proxy (fixed in 4.1.126.Final-aikido.22)
- io.root.io.netty:netty-handler-proxy (fixed in 4.1.126.Final-root.io.22)
Timeline and source
Published on 15 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
Other advisories for this package
io.netty:netty-handler-proxy has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-113: HTTP Response Splitting) in other software:
