Security Advisory catalog CVE-2026-91920
cve-program · CVE-2026-91920 Published
A flaw was found in the ChunkReader component of the Undertow web server, which is used to handle chunked transfer encoding in HTTP requests. The issue occurs because a security check for the chunk size is performed before the value is shifted, allowing a specifically crafted 15-digit chunk size to bypass the limit and overflow into internal state flags. This can cause the server to terminate a request body prematurely and interpret the remaining data as a separate, smuggled request.
Read the publisher's advisory Affected versions, risk and source history
cve-program · CVE-2026-91920 Published undertow-servlet https://access.redhat.com/downloads/content/package-browser/
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat build of Apache Camel for Spring Boot 4",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "undertow-servlet",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:camel_spring_boot:4"
]
} pki-core:10.6/resteasy https://access.redhat.com/downloads/content/package-browser/
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "pki-core:10.6/resteasy",
"defaultStatus": "unknown",
"cpes": [
"cpe:/a:redhat:enterprise_linux:8"
]
} pki-deps:10.6/resteasy https://access.redhat.com/downloads/content/package-browser/
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "pki-deps:10.6/resteasy",
"defaultStatus": "unknown",
"cpes": [
"cpe:/a:redhat:enterprise_linux:8"
]
} resteasy https://access.redhat.com/downloads/content/package-browser/
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "resteasy",
"defaultStatus": "unknown",
"cpes": [
"cpe:/a:redhat:enterprise_linux:9"
]
} undertow-servlet https://access.redhat.com/downloads/content/package-browser/
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat Fuse 7",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "undertow-servlet",
"defaultStatus": "unaffected",
"cpes": [
"cpe:/a:redhat:jboss_fuse:7"
]
} jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
]
} jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
]
} jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
]
} undertow-servlet https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "undertow-servlet",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
]
} undertow-servlet https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "undertow-servlet",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
]
} undertow-servlet https://access.redhat.com/jbossnetwork/restricted/listSoftware.html
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "undertow-servlet",
"defaultStatus": "unaffected",
"cpes": [
"cpe:/a:redhat:jbosseapxp"
]
} undertow-servlet https://access.redhat.com/downloads/content/package-browser/
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Red Hat",
"product": "Red Hat Single Sign-On 7",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "undertow-servlet",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
]
} Original source record · Cite this exact observation · Complete original publisher JSON