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OpenAdvisories
Critical · 9.1 CVE-2026-87830 EUVD-2026-89792GHSA-66vg-36xv-j6x4

Apache WSS4J: Streaming WS-SecurityPolicy validation may skip element-protection checks.

Published Sep 30, 2026 · Updated Sep 30, 2026 · Assigned by apache

Description

In the StAX streaming WS-SecurityPolicy validator, certain relative or unsupported XPath expressions can be converted into paths that never match the actual XML element path. A remote SOAP peer may therefore send a required element without the expected signature or encryption.
Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

Affected products

VendorProductAffectedFixed
Apache Software Foundation Apache WSS4J 4.0.0 – < 4.0.2, 3.0.0 – < 3.0.6, < 2.4.4 4.0.2

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 wss4j No fix yet —
Debian 13 wss4j No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 wss4j No fix yet —
Ubuntu 26.04 LTS wss4j No fix yet —
Ubuntu 24.04 LTS wss4j No fix yet —
Ubuntu 20.04 LTS wss4j No fix yet —
Ubuntu 16.04 LTS wss4j No fix yet —

References