CVE-2026-64958 — cxf
HIGHCVE-2026-64958 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability. A fix is available — see the affected versions and patch details below.
Apache CXF: Denial of service via message header attachments
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-64958.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
An incomplete fix for CVE-2026-50645 means that it is still possible to perform a denial of service attack on Apache CXF by sending a message with many attachment headers. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.
Affected Products
cxfapacheDetection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for CVE-2026-64958, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability is rated as Important rather than Moderate because an unauthenticated remote attacker can exhaust application server resources without requiring elevated privileges or interaction from users. In environments running Red Hat Enterprise Application Platform, JBoss Web Server, or Apache Camel,…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat JBoss Enterprise Application Platform 8.1 | cxf | RHSA-2026:95887 |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 | eap8-apache-cxf-0:4.1.8-1.redhat_00001.1.el10eap | RHSA-2026:92059 |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 | eap8-apache-cxf-0:4.1.8-1.redhat_00001.1.el8eap | RHSA-2026:92057 |
| Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 | eap8-apache-cxf-0:4.1.8-1.redhat_00001.1.el9eap | RHSA-2026:92056 |
Frequently Asked Questions
Is CVE-2026-64958 in your dependencies?
Find it across your dependency tree, including transitive dependencies.