How severe is CVE-2026-64958?

CVE-2026-64958 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-64958 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-64958?

CVE-2026-64958 affects Apache Cxf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-64958?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-64958 published?

CVE-2026-64958 was published on 2026-08-06.

CVE-2026-64958

CVE-2026-64958 is a high-severity vulnerability in Apache Cxf with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Apache Cxf
Published: 2026-08-06
Last modified: 2026-08-06

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-64958?: CVE-2026-64958 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-64958 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-64958?: CVE-2026-64958 affects Apache Cxf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-64958?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-64958 published?: CVE-2026-64958 was published on 2026-08-06.

References

https://lists.apache.org/thread/trsnkxc2f21585zlt819blvchgl6oykb

Affected products (1)

cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*

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