CVE-2026-93566— Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line
Quick assessment
Affected
Red Hat Red Hat AMQ Broker 7
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Summary Netty skips strict chunk size line validation when the line has no chunk extension ( ), so a chunk size line containing an embedded bare CR (e.g. ) is accepted instead of rejected, enabling HTTP request smuggling. Details only runs the strict validator
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I. Basic Information for CVE-2026-93566
Vulnerability Information
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Vulnerability Title
Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line
Source: CVE Program / CVE List V5
Vulnerability Description
### Summary
Netty skips strict chunk size line validation when the line has no chunk extension (`;`), so a chunk size line containing an embedded bare CR (e.g. `0\rX`) is accepted instead of rejected, enabling HTTP request smuggling.
### Details
`io.netty.handler.codec.http.HttpObjectDecoder#checkChunkExtensions` only runs the strict validator `HttpChunkLineValidatingByteProcessor` when a `;` is present:
```java
int extensionsStart = line.bytesBefore((byte) ';');
if (extensionsStart == -1) {
return;
}
```
According to RFC 9112 https://datatracker.ietf.org/doc/html/rfc9112#appendix-A
`chunk-size = 1*HEXDIG`
### PoC
```java
@Test
public void test() {
String requestStr = "POST / HTTP/1.1\r\n" +
"Host: localhost\r\n" +
"Transfer-Encoding: chunked\r\n\r\n" +
"0\rX\r\n" +
"\r\n" +
"GET /smuggled HTTP/1.1\r\n" +
"Host: localhost\r\n" +
"Content-Length: 0\r\n" +
"\r\n";
EmbeddedChannel channel = new EmbeddedChannel(new HttpRequestDecoder());
assertTrue(channel.writeInbound(Unpooled.copiedBuffer(requestStr, Ch
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
OWASP 2017年十大分类A9-使用含有已知漏洞的组件
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat AMQ Broker 7 | - |
cpe:/a:redhat:amq_broker:7
|
|
| Red Hat | Red Hat AMQ Clients | - |
cpe:/a:redhat:amq_clients:2023
|
|
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 | - |
cpe:/a:redhat:camel_quarkus:3
|
|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | - |
cpe:/a:redhat:camel_spring_boot:4
|
|
| Red Hat | Red Hat build of Apicurio Registry 3 | - |
cpe:/a:redhat:apicurio_registry:3
|
|
| Red Hat | Red Hat build of Debezium 3 | - |
cpe:/a:redhat:debezium:3
|
|
| Red Hat | Red Hat Build of Keycloak | - |
cpe:/a:redhat:build_keycloak:
|
|
| Red Hat | Red Hat build of Quarkus | - |
cpe:/a:redhat:quarkus:3
|
|
| Red Hat | Red Hat Data Grid 8 | - |
cpe:/a:redhat:jboss_data_grid:8
|
|
| Red Hat | Red Hat Fuse 7 | - |
cpe:/a:redhat:jboss_fuse:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | - |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | - |
cpe:/a:redhat:jboss_enterprise_application_platform:8
|
|
| Red Hat | Red Hat Single Sign-On 7 | - |
cpe:/a:redhat:red_hat_single_sign_on:7
|
|
II. Public POCs for CVE-2026-93566
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-93566 (2)
Same Patch Batch · Red Hat · 2026-09-18 · 37 CVEs total
| CVE-2026-93569 | 8.2 HIGH | Io.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :au |
| CVE-2026-89059 | 7.5 HIGH | Resteasy-core: resteasy: iioimageprovider unbounded image decode (decompression-bomb dos) |
| CVE-2026-93563 | 7.5 HIGH | Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtprespon |
| CVE-2026-93488 | 7.5 HIGH | Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams |
| CVE-2026-93491 | 7.5 HIGH | Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 |
| CVE-2026-93572 | 7.5 HIGH | Io.netty/netty-codec-redis: netty: redisarrayaggregator nested resp headers multiply patch |
| CVE-2026-93560 | 7.5 HIGH | Io.netty/netty-codec-stomp: netty: stomp codec content-length long-to-int truncation cause |
| CVE-2026-93558 | 7.5 HIGH | Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserver |
| CVE-2026-93564 | 7.5 HIGH | Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf refere |
| CVE-2026-93575 | 7.5 HIGH | Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder |
| CVE-2026-93565 | 7.5 HIGH | Io.netty/netty-codec-http: netty rtspdecoder method-token smuggling via trailing control b |
| CVE-2026-93567 | 7.5 HIGH | Io.netty/netty-codec-http2: http/1 authority-form connect is translated to malformed http/ |
| CVE-2026-87743 | 7.5 HIGH | Quarkus-vertx-http: authorization bypass via path normalization discrepancy in quarkus htt |
| CVE-2026-93576 | 7.5 HIGH | Io.netty/netty-codec-smtp: netty netty-codec-smtp — smtp command-name field is not crlf-va |
| CVE-2026-93568 | 7.5 HIGH | Io.netty/netty-codec-http2: io.netty/netty-codec-http3: netty: http/2 and http/3 extended |
| CVE-2026-91149 | 7.5 HIGH | Cockpit: cockpit: denial of service via unbounded connection thread spawning |
| CVE-2026-93494 | 7.5 HIGH | Io.netty/netty-codec-stomp: netty: bytebuf leak in stompsubframedecoder when a frame body |
| CVE-2026-89058 | 7.4 HIGH | Resteasy-core: resteasy: corsfilter reflects arbitrary origin with credentials under wildc |
| CVE-2026-81627 | 6.7 MEDIUM | Qemu-kvm: vapic writable rom alias can escape the option-rom window and expose locked smra |
| CVE-2026-93561 | 6.5 MEDIUM | Io.netty/netty-codec-memcache: netty: memcache binary codec signed/unsigned type mismatch |
Showing top 20 of 37 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Red Hat AMQ Broker 7
-
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Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested -
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V. Comments for CVE-2026-93566
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