CVE-2026-91864 Apache Software Foundation CVE debrief

Who should care

Defenders and administrators of Apache Neethi should assess exposure and prioritize upgrading to version 3.2.4 to prevent potential DoS attacks. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Operators, platforms, vulnerability-management, and security teams are impacted by this vulnerability.

Why it matters

CVE-2026-91864 is a high-severity vulnerability in Apache Neethi that can cause a denial-of-service (DoS) attack. Defenders and administrators should assess exposure and prioritize upgrading to version 3.2.4 to prevent potential DoS attacks.

• Potential denial-of-service (DoS) attacks
• Heap exhaustion due to unlimited content in WS-Policy documents
• Need to upgrade to version 3.2.4 to fix the issue

Technical summary

The vulnerability is caused by Apache Neethi's handling of WS-Policy documents, which allows an attacker to craft a document that can cause a heap exhaustion due to unlimited content being copied into memory without proper size limits. This issue can lead to a denial-of-service (DoS) attack. The vulnerability has a high severity and defenders should assess exposure and prioritize upgrading to version 3.2.4 to prevent potential DoS attacks. The vulnerability affects Apache Neethi, specifically versions prior to 3.2.4.

Defensive priority

Upgrade to version 3.2.4 to fix the DoS vulnerability

Recommended defensive actions

• Upgrade to version 3.2.4
• Review and update WS-Policy document handling
• Monitor for potential DoS attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, its impact, and recommended actions. The vulnerability affects Apache Neethi, specifically version prior to 3.2.4. Defenders should verify affected scope, severity, and vendor guidance. Evidence limits and known affected scope should be reviewed. The CVE Program and NVD provide official records and assessments.

Sources and 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.