What is CVE-2026-64958?

CVE-2026-64958 is a high-severity vulnerability in Apache Cxf, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-06.

How severe is CVE-2026-64958?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Apache Cxf

CVE-2026-64958

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-08-06 · last modified 2026-10-24.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.8th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Apache Cxf
Apache Software Foundation Cxf — versions 4.2.0, 4.0.0, 0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

lists.apache.org/thread/trsnkxc2f21585zlt819blvchgl6oykb (vendor-advisory, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2026-64958?: CVE-2026-64958 is a high-severity vulnerability in Apache Cxf, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-06.
How severe is CVE-2026-64958?: High severity. CVSS v3 base score is 7.5 out of 10.