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Message-ID: <79a84ab1-6c1b-97d9-801b-ec269daefc5a@apache.org>
Date: Mon, 05 Oct 2026 07:12:32 +0000
From: Lukasz Lenart <lukaszlenart@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-104712: Apache Struts: Disproportionate response size
when rendering BigDecimal request parameters
Severity: moderate
Affected versions:
- Apache Struts 2.5.14 through 2.5.33
- Apache Struts 6.0.0 through 6.11.0
- Apache Struts 7.0.0 through 7.3.0
Description:
Asymmetric resource consumption (amplification) vulnerability in Apache Struts. When a request parameter is bound to an arbitrary-precision decimal (java.math.BigDecimal) property that is then rendered through the Struts tag library, the framework can produce a response many orders of magnitude larger than the request, allowing an unauthenticated remote attacker to exhaust server CPU and outbound network capacity with sustained low-volume traffic. Applications that do not bind request parameters to BigDecimal properties, or never render such a property through the Struts tag library, are not affected.
This issue affects Apache Struts: from 2.5.14 through 2.5.33, from 6.0.0 through 6.11.0, from 7.0.0 through 7.3.0.
Users are recommended to upgrade to version 6.12.0 or 7.4.0, which fixes the issue.
Credit:
0xCc.zhang (finder)
References:
https://cwiki.apache.org/confluence/display/WW/S2-076
https://struts.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-104712
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