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Vulnerability record · CVE-2026-91866 · published 21 September 2026

CVE-2026-91866: Apache neethi allocation without limits vulnerability

Apache · Neethi

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.

7.5 CVSS 3.1 High EPSS 0.74% · top 47.2% CWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
25 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/zbfxnomgvbmqchqjgc6lk5h0z76k3gh4 Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/09/18/13 Mailing ListThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-91863Apache neethi vulnerabilityA specially crafted WS-Policy document with deeply nested policy elements can bypass Neethi's nesting-depth limit and exhaust the thread stack, crash…EPSS 0.76%7.5CVE-2026-91864Apache neethi allocation without limits vulnerabilityA specially crafted WS-Policy document can pack unlimited content inside a policy assertion, which Neethi copies into memory without counting it agai…EPSS 0.74%7.5CVE-2026-91865Apache neethi allocation without limits vulnerabilityA small WS-Policy document using repeated policy references can force Neethi to re-expand the same references exponentially during normalization, con…EPSS 0.74%7.5CVE-2026-66142Apache neethi uncontrolled resource consumption vulnerabilityApache Neethi is vulnerable to uncontrolled recursion when parsing policies that lack policy Ids or with deeply nested structures, which may lead to …EPSS 0.74%7.5CVE-2026-66143Apache neethi uncontrolled resource consumption vulnerabilityIt is possible to bypass the maximum number of normalized policy alternatives that was introduced in Apache Neethi 3.2.2 via certain crafted policies…EPSS 0.85%7.5CVE-2026-66144Apache neethi uncontrolled resource consumption vulnerabilityAlthough remote policy references are not retrieved during policy normalization, if they are manually retrieved via the API it can cause a denial of …EPSS 0.74%7.5CVE-2026-42403Apache neethi uncontrolled resource consumption vulnerabilityApache Neethi does not properly detect circular references in policy definitions. When a WS-Policy document contains circular policy references (wher…EPSS 0.80%7.5CVE-2026-42402Apache neethi uncontrolled resource consumption vulnerabilityApache Neethi is vulnerable to a Denial of Service attack through algorithmic complexity in policy normalization. Specially crafted WS-Policy documen…EPSS 0.74%

Source: NIST National Vulnerability Database (record CVE-2026-91866), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.