Vulnerability in Apache Software Foundation Apache Struts

[ Description ]Official 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.

[ Fixes ]Fixes and patches

• Security bulletin: Apache Struts S2-077Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-077, cited by CERT-FR CERTFR-2026-AVI-1290
• Security bulletin: Apache Struts S2-076Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-076, cited by CERT-FR CERTFR-2026-AVI-1290
• Security bulletin: Apache Struts S2-075Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-075, cited by CERT-FR CERTFR-2026-AVI-1290
• Security bulletin: Apache Struts S2-078Vendor patch or bulletin · CERT-FR · cwiki.apache.org/confluence/display/WW/S2-078, cited by CERT-FR CERTFR-2026-AVI-1290

[ Advisories ]Government CERT advisories

• CERT-FR9 Oct 2026CERTFR-2026-AVI-1290

  Multiple vulnerabilities in Apache Struts Translated from French

  Multiple vulnerabilities have been discovered in Apache Struts. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality. The vendor states…

  CVE-2026-104714CVE-2026-104711CVE-2026-104713+1 more CVEs
• BSI CERT-Bund4 Oct 2026WID-SEC-2026-3723

  Apache Struts: Multiple vulnerabilities Translated from German

  CVE-2026-104711CVE-2026-104714CVE-2026-104713+1 more CVEs

[ References ]References

• cwiki.apache.org/confluence/display/WW/S2-076Vendor Advisory
• www.openwall.com/lists/oss-security/2026/10/05/11Mailing ListThird Party Advisory