What is CVE-2026-91864?

CVE-2026-91864 is a high-severity vulnerability in Apache Neethi, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-21.

How severe is CVE-2026-91864?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Apache Neethi

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.

Published 2026-09-21 · last modified 2026-09-25.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (54.7th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

lists.apache.org/thread/400kbynbyhqhsjkv1yz251jm9wdz8z69 (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-91864?: CVE-2026-91864 is a high-severity vulnerability in Apache Neethi, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-21.
How severe is CVE-2026-91864?: High severity. CVSS v3 base score is 7.5 out of 10.