CVE-2026-91863: neethi — Fix

Description

A specially crafted WS-Policy document with deeply nested policy elements can bypass Neethi's nesting-depth limit and exhaust the thread stack, crashing the parser (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue.

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CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0076

Probability of exploitation

0.54%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-674 CWE-674

Affected Products

Vendor	Product	Versions
apache	neethi	< 3.2.4

References

Advisories & Patches

https://lists.apache.org/thread/72kxj71lvrqqx90xxqqctvpbw0t8mpxw

Other References

http://www.openwall.com/lists/oss-security/2026/09/18/10

Frequently Asked Questions

What is CVE-2026-91863? +

A specially crafted WS-Policy document with deeply nested policy elements can bypass Neethi's nesting-depth limit and exhaust the thread stack, crashing the parser (denial of service). Users are recommended to upgrade to version 3.2.4, which fixes this issue. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-91863? +

CVE-2026-91863 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0076, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-91863? +

CVE-2026-91863 affects products from apache, specifically: neethi. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-91863? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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