Vulnerability Details CVE-2026-104712
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 46.1%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-104712
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cpe:2.3:a:apache:struts:2.5.14
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cpe:2.3:a:apache:struts:2.5.14.1
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cpe:2.3:a:apache:struts:2.5.15
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cpe:2.3:a:apache:struts:2.5.16
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cpe:2.3:a:apache:struts:2.5.17
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cpe:2.3:a:apache:struts:2.5.18
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cpe:2.3:a:apache:struts:2.5.19
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cpe:2.3:a:apache:struts:2.5.20
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cpe:2.3:a:apache:struts:2.5.21
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cpe:2.3:a:apache:struts:2.5.22
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cpe:2.3:a:apache:struts:2.5.23
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cpe:2.3:a:apache:struts:2.5.24
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cpe:2.3:a:apache:struts:2.5.25
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cpe:2.3:a:apache:struts:2.5.26
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cpe:2.3:a:apache:struts:2.5.27
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cpe:2.3:a:apache:struts:2.5.28
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cpe:2.3:a:apache:struts:2.5.28.1
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cpe:2.3:a:apache:struts:2.5.28.2
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cpe:2.3:a:apache:struts:2.5.28.3
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cpe:2.3:a:apache:struts:2.5.29
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cpe:2.3:a:apache:struts:2.5.30
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cpe:2.3:a:apache:struts:2.5.31
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cpe:2.3:a:apache:struts:2.5.32
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cpe:2.3:a:apache:struts:2.5.33