CVE-2026-85532: wss4j Input Validation Flaw — Fix

Description

Apache WSS4J accepted attacker-controlled derived-key lengths and offsets without adequate bounds. This could permit cryptographically weak keys or excessive CPU and memory consumption when processing crafted WS-Security messages. The fixes enforce a minimum key length of 16 bytes, a maximum length of 512 bytes, and a maximum offset of 4096 bytes. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix 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

0.0055

Probability of exploitation

0.44%

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-20 Improper Input Validation

Affected Products

Vendor	Product	Versions
apache	wss4j	< 2.4.4
apache	wss4j	3.0.0 — 3.0.6
apache	wss4j	4.0.0 — 4.0.2

References

Advisories & Patches

https://lists.apache.org/thread.html/7jllcpbf4nbzhdp2vchz5yplnl5w6vd6

Other References

http://www.openwall.com/lists/oss-security/2026/09/30/8

Frequently Asked Questions

What is CVE-2026-85532? +

Apache WSS4J accepted attacker-controlled derived-key lengths and offsets without adequate bounds. This could permit cryptographically weak keys or excessive CPU and memory consumption when processing crafted WS-Security messages. The fixes enforce a minimum key length of 16 bytes, a maximum length of 512 bytes, and a maximum offset of 4096 bytes. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-85532? +

CVE-2026-85532 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 0.0055, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-85532? +

CVE-2026-85532 affects products from apache, specifically: wss4j. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-85532? +

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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