CVE-2026-93579

Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)

No known exploitation. EPSS puts it in the 45th percentile. Only a workaround so far.

CVSS 3.16.5Medium EPSS percentile45th0.6% chance in 30 days CISA KEVNot listedNo confirmed exploitation
No public exploit known FixWorkaroundNo fixed build yet

Published 2026-09-18Updated 2026-09-24Sources: CVE.org, NVD

NVD CVE.org

What to do

No fixed build is published yet. The vendor describes a workaround.

What it is

From the CVE record

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS45th

CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.6% chance of exploitation activity in the next 30 days, which ranks it in the 45th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

12 events over 6 days, from the signal feeds we watch.

2026-09-24Workaround availablerecord updated
2026-09-22Workaround availablerecord updated
2026-09-21Workaround availableworkaround available, record updated, record updated
2026-09-18Workaround availablepublished, weakness classified, record updated

Affected products

Red Hatcommercial · US
- Red Hat AMQ Broker 7On-premOperating Systems / linux-distro
- Red Hat build of Apache Camel 4 for Quarkus 3LibraryLibraryOSS Libraries / generic-library
- Red Hat build of Apache Camel for Spring Boot 4LibraryLibraryOSS Libraries / generic-library
- Red Hat build of Apicurio Registry 3On-premDevTools & CI
- Red Hat build of Debezium 3LibraryOn-premOSS Libraries / generic-library
- Red Hat Build of KeycloakWeb & CMS Plugins
- Red Hat Data Grid 8DatabaseOn-premDatabases / cache-message-queue
- Red Hat Fuse 7Dev ToolOn-premDevTools & CI / ci-cd

And 3 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Scored 6.5 by NVD.

How it is reached

Attack Vector NetworkExploitable remotely over the network without any special conditions
Attack Complexity LowNo special conditions — the attack can be reliably reproduced
Privileges Required NoneNo authentication required — anyone can exploit this
User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

Confidentiality LowSome restricted information is disclosed, but limited in scope
Integrity LowData modification is possible but limited in scope or consequence
Availability NoneNo availability impact

Weaknesses

CWE-1035No name in the record

Sources

References in the record

And 1 more reference. See all after sign-in

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