CVE-2026-50634: A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadat

Routine

MEDIUM 6.5REMOTEWATCHLISTUPGRADE

CVE-2026-50634 is a medium-severity flaw (CVSS 6.5) affecting cxf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadata that was not authenticated by the accepted signature. This can bypass the application's assumption that accepted `Content-Type` or protected HTTP-header metadata came from a verified signature entry, and may steer downstream JAX-RS entity parsing or signed-header consistency checks. Users are recommended to upgrade to versions 4.2.2 or

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-06-12
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-06-12 10:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

apache cxf UPGRADE

Affected: < 4.1.7 · >= 4.2.0 and < 4.2.2

Fixed in: 4.1.7, 4.2.2

Safe to downgrade to: a release before 4.2.0

1. Check installed version

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

2. UPGRADE to 4.1.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cxf

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 4.2.0 (Debian / Ubuntu)

apt-cache madison cxf sudo apt install cxf=<VERSION_BEFORE_4.2.0> sudo apt-mark hold cxf

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

dnf --showduplicates list cxf sudo dnf downgrade cxf-<VERSION_BEFORE_4.2.0> sudo dnf versionlock add cxf

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-2026-50634?

cxf: upgrade to 4.1.7, 4.2.2. Exact commands for each OS are on this page.

Is CVE-2026-50634 being exploited?

CVE-2026-50634 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-2026-50634 affect?

CVE-2026-50634 affects cxf. Severity is medium (CVSS 6.5). A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadata that was not authenticated by the accepted signature. This can bypass the application's assumption that accepted `Content-Type`

How urgent is CVE-2026-50634?

Priority 38/100. Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-50628 CRITICAL 9.8 UPGRADE A logic error in OAuthRequestFilter rejects legitimate requests originating from the bound IP address, while b
CVE-2026-50627 CRITICAL 9.1 UPGRADE The JwtAccessTokenValidator class in Apache CXF fails to validate the 'aud' (Audience) claims of incoming JWT
CVE-2026-49875 CRITICAL 9.8 UPGRADE Apache CXF's EndpointReferenceUtils and W3CMultiSchemaFactory classes construct a SAXParserFactory without the
CVE-2026-50633 HIGH 8.1 UPGRADE A JNDI Injection vulnerability has been discovered in Apache CXF's JCA integration module, which can allow for
CVE-2026-50632 HIGH 8.1 UPGRADE A further incomplete fix for a previous advisory CVE-2026-44417 (Untrusted JMS configuration can lead to RCE)

References

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