CVE-2026-40859: Deserialization of Untrusted Data vulnerability in Apache Camel. The camel-vertx-http component deserializes

Q: How do I fix CVE-2026-40859?

camel: upgrade to 4.14.8, 4.18.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-40859 being exploited?

CVE-2026-40859 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-2026-40859 affect?

CVE-2026-40859 affects camel. Severity is high (CVSS 8.1). Deserialization of Untrusted Data vulnerability in Apache Camel. The camel-vertx-http component deserializes HTTP response bodies carrying the Content-Type application/x-java-serialized-object using a raw java.io.ObjectInputStream, without

Q: How urgent is CVE-2026-40859?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 8.1REMOTEWATCHLISTUPGRADE

CVE-2026-40859 is a high-severity flaw (CVSS 8.1) affecting camel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of Untrusted Data vulnerability in Apache Camel. The camel-vertx-http component deserializes HTTP response bodies carrying the Content-Type application/x-java-serialized-object using a raw java.io.ObjectInputStream, without applying any ObjectInputFilter (VertxHttpHelper.deserializeJavaObjectFromStream) This deserialization path is reached only when the producer endpoint is configured with transferException=true (or the component

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	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-07-06
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-06 09:16 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

apache camel UPGRADE

Affected: >= 4.0.0 and < 4.14.8 · >= 4.15.0 and < 4.18.3 · 4.19.0

Fixed in: 4.14.8, 4.18.3

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to 4.14.8 (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 4.0.0 (Debian / Ubuntu)

apt-cache madison camel sudo apt install camel=<VERSION_BEFORE_4.0.0> 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_4.0.0> 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-vertx-http · FIXED · 4.14.8 · vulnerable: >= 4.0.0, < 4.14.8 · source

Set org.apache.camel:camel-vertx-http to 4.14.8 or later in pom.xml or build.gradle, then rebuild and redeploy.

Maven · org.apache.camel:camel-netty-http · FIXED · 4.14.8 · vulnerable: >= 4.0.0, < 4.14.8 · source

Set org.apache.camel:camel-netty-http to 4.14.8 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora ELN · nginx-mod-headers-more · FIXED · 0.41-1.eln159 · FEDORA-2026-31f55f396a · source

sudo dnf upgrade --advisory=FEDORA-2026-31f55f396a

Fedora 46 · erlang-hex_core · FIXED · 0.21.1-1.fc46 · FEDORA-2026-f3389199ff · source

sudo dnf upgrade --advisory=FEDORA-2026-f3389199ff

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-2026-40859 (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-2026-40859?

camel: upgrade to 4.14.8, 4.18.3. Exact commands for each OS are on this page.

Is CVE-2026-40859 being exploited?

CVE-2026-40859 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-2026-40859 affect?

CVE-2026-40859 affects camel. Severity is high (CVSS 8.1). Deserialization of Untrusted Data vulnerability in Apache Camel. The camel-vertx-http component deserializes HTTP response bodies carrying the Content-Type application/x-java-serialized-object using a raw java.io.ObjectInputStream, without

How urgent is CVE-2026-40859?

Priority 53/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

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References

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