CVE-2026-64958

Apache CXF: Denial of service via message header attachments

HIGH

7.5

CVSS Score

Published: August 6, 2026 at 10:13 AM UTC

Updated: October 24, 2026 at 04:10 PM UTC

1 product affected across 1 vendorCXF

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Severity

HIGH7.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

CXF · Apachemaven

95%

v < 3.6.124.0.0 ≤ v < 4.1.84.2.0 ≤ v < 4.2.34.0.0 4.2.0

Affected range stops below 3.6.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.1.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.2.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

Vendor AdvisoryMailing List

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-400

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