CVE-2026-78329: Improper input validation vulnerability in Apache Camel Undertow component. This issue affects Apache Camel

Q: How do I fix CVE-2026-78329?

camel: upgrade to 4.14.9, 4.18.4, 4.22.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-78329 being exploited?

CVE-2026-78329 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-2026-78329 affect?

CVE-2026-78329 affects camel. Severity is critical (CVSS 9.8). Improper input validation vulnerability in Apache Camel Undertow component. This issue affects Apache Camel: from 4.11.0 before 4.14.9, from 4.15.0 before 4.18.4, from 4.19.0 before 4.22.0. UndertowEndpoint defaulted its headerFilterS

Q: How urgent is CVE-2026-78329?

Priority 61/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-78329 is a critical-severity flaw (CVSS 9.8) affecting camel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input validation vulnerability in Apache Camel Undertow component. This issue affects Apache Camel: from 4.11.0 before 4.14.9, from 4.15.0 before 4.18.4, from 4.19.0 before 4.22.0. UndertowEndpoint defaulted its headerFilterStrategy field to the base HttpHeaderFilterStrategy and pushed that instance into the UndertowHttpBinding it creates lazily, overwriting the UndertowHeaderFilterStrategy that DefaultUndertowHttpBinding installs

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-08-24
Last modified	2026-10-12

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-12 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-24 17:18 UTCPublished CVE record published
2026-10-12 15:10 UTCUpdated Record last modified

apache camel UPGRADE

Affected: >= 4.11.0 and < 4.14.9 · >= 4.15.0 and < 4.18.4 · >= 4.19.0 and < 4.22.0

Fixed in: 4.14.9, 4.18.4, 4.22.0

Safe to downgrade to: a release before 4.11.0

1. Check installed version

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

2. UPGRADE to 4.14.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade camel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade camel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.11.0 (Debian / Ubuntu)

apt-cache madison camel sudo apt install camel=<VERSION_BEFORE_4.11.0> sudo apt-mark hold camel

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list camel sudo dnf downgrade camel-<VERSION_BEFORE_4.11.0> sudo dnf versionlock add camel

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.

Exact fixes by distribution

Maven · org.apache.camel:camel-undertow · FIXED · 4.14.9 · vulnerable: >= 4.11.0, < 4.14.9 · source

Set org.apache.camel:camel-undertow to 4.14.9 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: oscerd/CVE-2026-78329 (0 stars)

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-2026-78329?

camel: upgrade to 4.14.9, 4.18.4, 4.22.0. Exact commands for each OS are on this page.

Is CVE-2026-78329 being exploited?

CVE-2026-78329 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-2026-78329 affect?

CVE-2026-78329 affects camel. Severity is critical (CVSS 9.8). Improper input validation vulnerability in Apache Camel Undertow component. This issue affects Apache Camel: from 4.11.0 before 4.14.9, from 4.15.0 before 4.18.4, from 4.19.0 before 4.22.0. UndertowEndpoint defaulted its headerFilterS

How urgent is CVE-2026-78329?

Priority 61/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

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References

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