Apache Struts: Disproportionate response size when rendering BigDecimal request parameters

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-104712
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-05 19:17:14 UTC
Updated2026-10-05 20:17:08 UTC
DescriptionAsymmetric 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.

Risk And Classification

Problem Types: CWE-405 | CWE-405 CWE-405 Asymmetric Resource Consumption (Amplification)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Struts affected 2.5.14 2.5.33 semver Not specified
CNA Apache Software Foundation Apache Struts affected 6.0.0 6.11.0 semver Not specified
CNA Apache Software Foundation Apache Struts affected 7.0.0 7.3.0 semver Not specified

References

ReferenceSourceLinkTags
cwiki.apache.org/confluence/display/WW/S2-076 [email protected] cwiki.apache.org
www.openwall.com/lists/oss-security/2026/10/05/11 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: 0xCc.zhang (en)

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