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CVE-2026-91866— Apache Neethi: Crafted policies cause unbounded work during intersection leading to denial of service

Quick assessment

Affected
Apache Software Foundation Apache Neethi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

A specially crafted pair of WS-Policy documents can force Neethi's policy-intersection to do exponential amounts of work, pinning the CPU for a long time (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.

EPSS 0.42% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apache Software Foundation Apache Neethi < 3.2.4 affected
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I. Basic Information for CVE-2026-91866

Vulnerability Information

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Vulnerability Title
Apache Neethi: Crafted policies cause unbounded work during intersection leading to denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A specially crafted pair of WS-Policy documents can force Neethi's policy-intersection to do exponential amounts of work, pinning the CPU for a long time (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Neethi 0 ~ 3.2.4 -

II. Public POCs for CVE-2026-91866

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III. Intelligence Information for CVE-2026-91866

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Mailing List Discussions for CVE-2026-91866 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-21 · 10 CVEs total

CVE-2026-94301 9.8 CRITICAL Apache MINA: CVE-2026-47065 resolveProxyClass fix missing from 2.0.X and 2.1.X branches (2
CVE-2026-47321 7.5 HIGH Apache MINA: Unbounded Decompression Amplification DoS in Zlib.inflate
CVE-2026-91863 Apache Neethi: Uncontrolled recursion while parsing crafted WS-Policy documents allows den
CVE-2026-91864 Apache Neethi: Crafted WS-Policy documents bypass element/attribute limits causing memory
CVE-2026-91865 Apache Neethi: Crafted policy references cause exponential expansion during normalization
CVE-2026-91867 Apache Neethi: Remote policy fetch lacks a total timeout, allowing a slow server to hang t
CVE-2026-82355 Apache Airflow: Session cookie silently overrides explicit Authorization bearer header, en
CVE-2026-75158 Apache Airflow: Assets events API returns asset events for every Dag with no per-Dag autho
CVE-2026-86473 Apache Airflow: Logout ignores a presented Authorization bearer token, leaving it revocabl

IV. Related Vulnerabilities

Same product: Apache Neethi
Same vendor: Apache Software Foundation

V. Comments for CVE-2026-91866

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