How severe is CVE-2026-91864?

CVE-2026-91864 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-91864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-91864?

CVE-2026-91864 affects Apache Neethi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-91864?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-91864 published?

CVE-2026-91864 was published on 2026-09-21 and last updated on 2026-09-25.

CVE-2026-91864

CVE-2026-91864 is a high-severity vulnerability in Apache Neethi with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Apache Neethi
Published: 2026-09-21
Last modified: 2026-09-25

Description

A specially crafted WS-Policy document can pack unlimited content inside a policy assertion, which Neethi copies into memory without counting it against its size limits, exhausting the heap (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.

Frequently asked questions

What is CVE-2026-91864?: A specially crafted WS-Policy document can pack unlimited content inside a policy assertion, which Neethi copies into memory without counting it against its size limits, exhausting the heap (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.
How severe is CVE-2026-91864?: CVE-2026-91864 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-91864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-91864?: CVE-2026-91864 affects Apache Neethi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-91864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-91864 published?: CVE-2026-91864 was published on 2026-09-21 and last updated on 2026-09-25.

References

Affected products (1)

cpe:2.3:a:apache:neethi:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Neethi

CVE-2026-91866 — High (CVSS 7.5): A specially crafted pair of WS-Policy documents can force Neethi's policy-intersection to do exponential amounts of…
CVE-2026-91865 — High (CVSS 7.5): A small WS-Policy document using repeated policy references can force Neethi to re-expand the same references…
CVE-2026-91863 — High (CVSS 7.5): A specially crafted WS-Policy document with deeply nested policy elements can bypass Neethi's nesting-depth limit and…
CVE-2026-66144 — High (CVSS 7.5): Although remote policy references are not retrieved during policy normalization, if they are manually retrieved via the…
CVE-2026-66143 — High (CVSS 7.5): It is possible to bypass the maximum number of normalized policy alternatives that was introduced in Apache Neethi…
CVE-2026-66142 — High (CVSS 7.5): Apache Neethi is vulnerable to uncontrolled recursion when parsing policies that lack policy Ids or with deeply nested…

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