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CVE record · CVE-2026-91920

Undertow: undertow: chunkreader message length permits chunk-size overflow

CVSS 6.5 MediumEPSS 0.0024 · 14th percentile

Published by the CVE Program (CNA: redhat) at 30 Oct 2026, 01:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Red Hat Red Hat build of Apache Camel for Spring Boot 4 Package name: undertow-servlet https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Red Hat Red Hat Enterprise Linux 8 Package name: pki-core:10.6/resteasy https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: unknown
Red Hat Red Hat Enterprise Linux 8 Package name: pki-deps:10.6/resteasy https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: unknown
Red Hat Red Hat Enterprise Linux 9 Package name: resteasy https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: unknown
Red Hat Red Hat Fuse 7 Package name: undertow-servlet https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: unaffected
Red Hat Red Hat JBoss Enterprise Application Platform 7 Package name: jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 https://access.redhat.com/jbossnetwork/restricted/listSoftware.html No versions given Other versions: affected
Red Hat Red Hat JBoss Enterprise Application Platform 7 Package name: jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 https://access.redhat.com/jbossnetwork/restricted/listSoftware.html No versions given Other versions: affected
Red Hat Red Hat JBoss Enterprise Application Platform 7 Package name: jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 https://access.redhat.com/jbossnetwork/restricted/listSoftware.html No versions given Other versions: affected
Red Hat Red Hat JBoss Enterprise Application Platform 7 Package name: undertow-servlet https://access.redhat.com/jbossnetwork/restricted/listSoftware.html No versions given Other versions: affected
Red Hat Red Hat JBoss Enterprise Application Platform 8 Package name: undertow-servlet https://access.redhat.com/jbossnetwork/restricted/listSoftware.html No versions given Other versions: affected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack Package name: undertow-servlet https://access.redhat.com/jbossnetwork/restricted/listSoftware.html No versions given Other versions: unaffected
Red Hat Red Hat Single Sign-On 7 Package name: undertow-servlet https://access.redhat.com/downloads/content/package-browser/ No versions given Other versions: affected
Identifiers
CVE-2026-91920
CNA
redhat
Weakness (CWE)
CWE-444
Tags
Published
30 Oct 2026
Updated
6 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 14th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 30 Oct 2026, 01:16 UTC Confirmed by the CVE List
  2. 30 Oct 2026, 02:17 UTC Confirmed by NVD

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.