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CVE-2026-91865· NVD / CVE Program· CNA apache

Apache Neethi: Crafted policy references cause exponential expansion during normalization leading to denial of service

A small WS-Policy document using repeated policy references can force Neethi to re-expand the same references exponentially during normalization, consuming huge amounts of CPU and memory (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi analysis

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Published
Sep 21, 2026
Updated
Sep 25, 2026
EPSS
0.7% · 53th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
apacheneethi

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache neethibefore 3.2.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache Neethi

    • before 3.2.4affected · semver

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-91866Apache Neethi: Crafted policies cause unbounded work during intersection leading to denial of service
    30Monitor
  • CVE-2026-91864Apache Neethi: Crafted WS-Policy documents bypass element/attribute limits causing memory exhaustion
    30Monitor
  • CVE-2026-91863Apache Neethi: Uncontrolled recursion while parsing crafted WS-Policy documents allows denial of service
    30Monitor
  • CVE-2026-66144Apache Neethi: Remote PolicyReference fetch lacks resource bounds
    30Monitor
  • CVE-2026-66143Apache Neethi: Missing global alternative-output budget across policy computation paths
    30Monitor
  • CVE-2026-66142Apache Neethi: Uncontrolled recursion in policy processing
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Apache Software Foundation Apache Neethi3.2.4Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-918640 days apartApache Neethi: Crafted WS-Policy documents bypass element/attribute limits causing memory exhaustion
    30Monitor
  • CVE-2026-918660 days apartApache Neethi: Crafted policies cause unbounded work during intersection leading to denial of service
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records