High severity · published Sep 18, 2026
CVE-2026-93491
Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% 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 Apache Camel 3.33.3.SP2 · 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-2026-93491
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93491
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-2026:70257
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:83612
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-93491
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2536891
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