Medium severity · published Sep 18, 2026
CVE-2026-93574
Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing
6.5
CVSS
1.4%
EPSS
No
On KEV
Description
A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat AMQ Broker 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat AMQ Clients · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Build of Keycloak · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Data Grid 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Fuse 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Single Sign-On 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat build of Apache Camel 4 for Quarkus 3 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat build of Apache Camel for Spring Boot 4 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat build of Apicurio Registry 3 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93574
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93574
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:69440
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:69470
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:83612
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-93574
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2536966
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