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CVE-2026-50645 Apache Software Foundation CVE debrief

CVE-2026-50645 is a HIGH severity vulnerability in Apache CXF, with a CVSS score of 7.5. The vulnerability occurs because 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, which fix this issue by imposing a maximum default of 500 attachments per message.

Vendor
Apache Software Foundation
Product
Apache CXF
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-08-07
Advisory published
2026-06-12
Advisory updated
2026-08-07

Who should care

Users of Apache CXF, particularly those using versions prior to 4.2.2 or 4.1.7, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by the lack of restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF. This can lead to uncontrolled resource consumption or a denial of service attack. The vulnerability has been fixed in versions 4.2.2 and 4.1.7 of Apache CXF.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Apache CXF version 4.2.2 or 4.1.7, or later.

Evidence notes

The CVE-2026-50645 vulnerability was published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-50645) and has a detailed description on [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-50645).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50645 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50645

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50645 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50645

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.