CVE-2026-50645 Apache CXF: No restriction on attachment headers per message

What is CVE-2026-50645?

CVE-2026-50645 is a high-severity denial of service vulnerability in Apache Cxf, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

There is no restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF, which can lead to uncontrolled resource consumption or a denial of service attack. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue by imposing a maximum default of 500 attachments per message.

Weakness: CWE-400

Which versions are affected by CVE-2026-50645?

6 open source packages ship an affected version, including org.apache.cxf:cxf-core. It affects 1 product.

Products include Apache Cxf.

How do I fix CVE-2026-50645?

Upgrade org.apache.cxf:cxf-core to a fixed version for your release line: 3.6.12, 4.1.7 or 4.2.2.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-50645 being exploited?

There is no known exploitation of CVE-2026-50645 in the wild and no public exploit code.

Other vulnerabilities in Apache Cxf

• CVE-2012-2379 XML Signature/Encryption Not Validated in Apache CXF Critical 10.0
• CVE-2026-66909 Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage Critical 9.8
• CVE-2026-68079 Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay Critical 9.8
• CVE-2026-50628 Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control Critical 9.8
• CVE-2025-48913 Apache CXF: Untrusted JMS configuration can lead to RCE Critical 9.8

All Apache Cxf vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-LW37073, CLSA-2026-1790900201, ECHO-0e19-deb4-9c3d, GHSA-ghvc-7hp8-2g2v, MINI-92vp-pxhx-wvhw.