# Undertow-core: undertow:http request smuggling via oversized chunk-size bit overlap

CVE record · `CVE-2026-14180`

- **Identifiers:** `CVE-2026-14180`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **CNA:** redhat
- **Weakness (CWE):** [CWE-444](https://cwe.mitre.org/data/definitions/444.html)
- **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md)
- **Technologies:** [Red Hat JBoss Enterprise Application Platform 8.1.8.GA](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-8-1-8-ga.md) · [Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-8-1-for-rhel-10.md) · [Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-8-1-for-rhel-8.md) · [Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-8-1-for-rhel-9.md) · [Red Hat build of Apache Camel for Spring Boot 4](https://agentprime.io/advisories/technology/red-hat-build-of-apache-camel-for-spring-boot-4.md) · [Red Hat build of Apache Camel - HawtIO 4](https://agentprime.io/advisories/technology/red-hat-build-of-apache-camel-hawtio-4.md) · [Red Hat Data Grid 8](https://agentprime.io/advisories/technology/red-hat-data-grid-8.md) · [Red Hat Enterprise Linux 10](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-10.md) · [Red Hat Enterprise Linux 8](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-8.md) · [Red Hat Enterprise Linux 9](https://agentprime.io/advisories/technology/red-hat-enterprise-linux-9.md) · [Red Hat Fuse 7](https://agentprime.io/advisories/technology/red-hat-fuse-7.md) · [Red Hat JBoss Enterprise Application Platform 7](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-7.md) · [Red Hat JBoss Enterprise Application Platform Expansion Pack](https://agentprime.io/advisories/technology/red-hat-jboss-enterprise-application-platform-expansion-pack.md) · [Red Hat Single Sign-On 7](https://agentprime.io/advisories/technology/red-hat-single-sign-on-7.md)
- **Published:** 11 Aug 2026
- **Updated:** 5 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: redhat) at 11 Aug 2026, 15:32 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

- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1.8.GA.
  - unaffected: `2.3.26.SP3-redhat-00001 to before *` (rpm)
  - Other versions: affected
  - Package name: `io.undertow/undertow-core`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.40.0-8.redhat_00024.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-activemq-artemis`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.1.7-1.SP1_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-apache-cxf`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.0.5-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-artemis-wildfly-integration`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:1.85.0-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-bouncycastle`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:1.2.7-1.redhat_00002.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-cryptacular`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:801.8.0-1.GA_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-eap-product-conf-parent`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:6.6.54-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-hibernate`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.1.5-5.redhat_00008.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-httpcomponents-asyncclient`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:3.0.22-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-ironjacamar`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-annotations`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-core`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-databind`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-dataformats-text`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-jaxrs-providers`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-modules-base`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.18.9-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jackson-modules-java8`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.0.5-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jakarta-xml-bind-api`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.0.7-4.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jaxb`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.1.0-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jaxbintros`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:3.6.3-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jboss-logging`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:5.0.31-1.SP2_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jboss-remoting`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:3.1.0-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jbossws-api`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.2.0-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jbossws-common-tools`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:7.4.0-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jbossws-cxf`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:3.0.1-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jbossws-jaxws-undertow-httpspi`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:5.1.0-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jbossws-spi`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.0.11-2.SP1_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-jsf-impl`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.25.4-1.redhat_00003.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-log4j`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:3.2.2-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-neethi`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.1.136-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-netty`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:4.1.136-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-netty-transport-native-epoll`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:9.37.4-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-nimbus-jose-jwt`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:1.1.9-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-parsson`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:3.0.6-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-saaj-impl`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.0.18-1.redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-slf4j`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.3.26-2.SP3_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-undertow`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:8.1.8-9.GA_redhat_00006.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-wildfly`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:2.6.11-1.Final_redhat_00001.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-wildfly-elytron`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`
- Vendor: Red Hat. Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10.
  - unaffected: `0:8.1.1-12.GA_redhat_00048.1.el10eap to before *` (rpm)
  - Other versions: affected
  - Package name: `eap8-wildfly-javadocs`
  - Collection: `https://access.redhat.com/downloads/content/package-browser/`

And 100 more products. The full list is on the CVE record: <https://www.cve.org/CVERecord?id=CVE-2026-14180>

## 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

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`, from CNA (redhat)

- **CISA KEV:** Not listed.
- **EPSS:** 0.010, the 63rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 11 Aug 2026, 15:32 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-14180)
- 11 Aug 2026, 16:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-14180)

## Sources

- [CVE List: CVE-2026-14180](https://www.cve.org/CVERecord?id=CVE-2026-14180)
- [NVD: CVE-2026-14180](https://nvd.nist.gov/vuln/detail/CVE-2026-14180)

### References from the CNA

- <https://access.redhat.com/errata/RHSA-2026:70228> (vendor-advisory, redhat)
- <https://access.redhat.com/errata/RHSA-2026:70229> (vendor-advisory, redhat)
- <https://access.redhat.com/errata/RHSA-2026:70230> (vendor-advisory, redhat)
- <https://access.redhat.com/errata/RHSA-2026:70277> (vendor-advisory, redhat)
- <https://access.redhat.com/security/cve/CVE-2026-14180> (vdb-entry, redhat)
- <https://bugzilla.redhat.com/show_bug.cgi?id=2494771> (issue-tracking, redhat)

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.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-14180>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-14180/>. Everything for agents: <https://agentprime.io/llms.txt>.