How severe is CVE-2026-42402?

CVE-2026-42402 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-2026-42402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42402?

CVE-2026-42402 affects Apache Neethi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42402?

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.

Does CVE-2026-42402 have an EU (EUVD) identifier?

Yes. CVE-2026-42402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26485.

When was CVE-2026-42402 published?

CVE-2026-42402 was published on 2026-05-01 and last updated on 2026-06-17.

CVE-2026-42402

CVE-2026-42402 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26485
Weakness: CWE-400
Affected product: Apache Neethi
Published: 2026-05-01
Last modified: 2026-06-17

Description

Apache Neethi is vulnerable to a Denial of Service attack through algorithmic complexity in policy normalization. Specially crafted WS-Policy documents can trigger an exponential Cartesian cross-product expansion during the normalization process, causing unbounded memory allocation that exhausts the JVM heap. This occurs when the normalization process generates an excessive number of policy alternatives without bounds, leading to runtime memory exhaustion. Users should upgrade to 3.2.2 which limits the maximum number of normalized policy alternatives.

Frequently asked questions

What is CVE-2026-42402?: Apache Neethi is vulnerable to a Denial of Service attack through algorithmic complexity in policy normalization. Specially crafted WS-Policy documents can trigger an exponential Cartesian cross-product expansion during the normalization process, causing unbounded memory allocation that exhausts the JVM heap. This occurs when the normalization process generates an excessive number of policy alternatives without bounds, leading to runtime memory exhaustion. Users should upgrade to 3.2.2 which limits the maximum number of normalized policy alternatives.
How severe is CVE-2026-42402?: CVE-2026-42402 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-2026-42402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42402?: CVE-2026-42402 affects Apache Neethi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42402?: 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.
Does CVE-2026-42402 have an EU (EUVD) identifier?: Yes. CVE-2026-42402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26485.
When was CVE-2026-42402 published?: CVE-2026-42402 was published on 2026-05-01 and last updated on 2026-06-17.

References

Affected products (1)

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

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