CVE-2026-28367: A flaw was found in Undertow

Q: How do I fix CVE-2026-28367?

build of apache camel - hawtio: downgrade or apply the listed mitigation; build of apache camel for spring boot: downgrade or apply the listed mitigation; data grid: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2026-28367 being exploited?

CVE-2026-28367 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28367 affect?

CVE-2026-28367 affects build of apache camel - hawtio, build of apache camel for spring boot, data grid. Severity is high (CVSS 8.7). A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Ser

Q: How urgent is CVE-2026-28367?

Priority 54/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 8.7REMOTEWATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2026-28367 is a high-severity flaw (CVSS 8.7) affecting build of apache camel - hawtio, build of apache camel for spring boot, data grid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer, potentially leading to unauthorized access or manipulation of web requests.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 17:16 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

redhat build of apache camel - hawtio DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy build-of-apache-camel---hawtio || rpm -q build-of-apache-camel---hawtio || build-of-apache-camel---hawtio --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison build-of-apache-camel---hawtio sudo apt install build-of-apache-camel---hawtio=<VERSION_BEFORE_4.0> sudo apt-mark hold build-of-apache-camel---hawtio

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list build-of-apache-camel---hawtio sudo dnf downgrade build-of-apache-camel---hawtio-<VERSION_BEFORE_4.0> sudo dnf versionlock add build-of-apache-camel---hawtio

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat build of apache camel for spring boot DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy build-of-apache-camel-for-spring-boot || rpm -q build-of-apache-camel-for-spring-boot || build-of-apache-camel-for-spring-boot --version

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison build-of-apache-camel-for-spring-boot sudo apt install build-of-apache-camel-for-spring-boot=<VERSION_BEFORE_4.0> sudo apt-mark hold build-of-apache-camel-for-spring-boot

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list build-of-apache-camel-for-spring-boot sudo dnf downgrade build-of-apache-camel-for-spring-boot-<VERSION_BEFORE_4.0> sudo dnf versionlock add build-of-apache-camel-for-spring-boot

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat data grid DOWNGRADE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

1. Check installed version

apt-cache policy data-grid || rpm -q data-grid || data-grid --version

2. No fixed release: DOWNGRADE to a release before 8.0 (Debian / Ubuntu)

apt-cache madison data-grid sudo apt install data-grid=<VERSION_BEFORE_8.0> sudo apt-mark hold data-grid

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list data-grid sudo dnf downgrade data-grid-<VERSION_BEFORE_8.0> sudo dnf versionlock add data-grid

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat fuse DOWNGRADE

Affected: 7.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy fuse || rpm -q fuse || fuse --version

2. No fixed release: DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison fuse sudo apt install fuse=<VERSION_BEFORE_7.0.0> sudo apt-mark hold fuse

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fuse sudo dnf downgrade fuse-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add fuse

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat jboss enterprise application platform DOWNGRADE

Affected: 7.0.0 · 8.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy jboss-enterprise-application-platform || rpm -q jboss-enterprise-application-platform || jboss-enterprise-application-platform --version

2. No fixed release: DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison jboss-enterprise-application-platform sudo apt install jboss-enterprise-application-platform=<VERSION_BEFORE_7.0.0> sudo apt-mark hold jboss-enterprise-application-platform

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jboss-enterprise-application-platform sudo dnf downgrade jboss-enterprise-application-platform-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add jboss-enterprise-application-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat jboss enterprise application platform expansion pack MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jboss-enterprise-application-platform-expansion-pack || rpm -q jboss-enterprise-application-platform-expansion-pack || jboss-enterprise-application-platform-expansion-pack --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Maven · io.undertow:undertow-parent · NO FIX YET · vulnerable: <= 2.3.23.Final · source

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

RHEL 10 · moditect · NOT AFFECTED

RHEL 8 · pki-core:10.6/resteasy · NOT AFFECTED

RHEL 8 · pki-deps:10.6/resteasy · NOT AFFECTED

RHEL 9 · resteasy · NOT AFFECTED

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28367?

build of apache camel - hawtio: downgrade or apply the listed mitigation; build of apache camel for spring boot: downgrade or apply the listed mitigation; data grid: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-28367 being exploited?

CVE-2026-28367 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28367 affect?

CVE-2026-28367 affects build of apache camel - hawtio, build of apache camel for spring boot, data grid. Severity is high (CVSS 8.7). A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header block terminator. This can be used for request smuggling with certain proxy servers, such as older versions of Apache Traffic Ser

How urgent is CVE-2026-28367?

Priority 54/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Spring Framework vulnerabilities · Google Cloud vulnerabilities · JBoss and WildFly vulnerabilities

References

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