CVE-2026-63621: Improper Input Validation, Improper Neutralization of Special Elements in Output Used by a Downstream Componen

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MEDIUM 5.3REMOTEWATCHLISTUPGRADE

CVE-2026-63621 is a medium-severity flaw (CVSS 5.3) affecting camel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Input Validation, Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in Apache Camel Knative component The Knative consumer in camel-knative maps inbound CloudEvent attributes onto Camel message headers. In binary content mode the HTTP-header path filters Camel-internal headers through KnativeHttpHeaderFilterStrategy, but in structured content mode (Content-Type application/c

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-20, CWE-74
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 17:17 UTCPublished CVE record published
2026-10-12 15:10 UTCUpdated Record last modified

apache camel UPGRADE

Affected: >= 3.15.0 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 3.15.0

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 3.15.0 (Debian / Ubuntu)

apt-cache madison camel sudo apt install camel=<VERSION_BEFORE_3.15.0> 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_3.15.0> 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.

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-2026-63621?

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

Is CVE-2026-63621 being exploited?

CVE-2026-63621 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-2026-63621 affect?

CVE-2026-63621 affects camel. Severity is medium (CVSS 5.3). Improper Input Validation, Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in Apache Camel Knative component The Knative consumer in camel-knative maps inbound CloudEvent att

How urgent is CVE-2026-63621?

Priority 41/100. Remotely exploitable, no login, no user action; On your watchlist

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References

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