CVE-2026-104712 Apache Struts: Disproportionate response size when rendering BigDecimal request parameters
Unauthenticated attackers can cause denial of service by triggering disproportionate response sizes when BigDecimal parameters are rendered, requiring specific application binding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104712?
CVE-2026-104712 is a high-severity denial of service vulnerability in Apache Struts, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-405
Which versions are affected by CVE-2026-104712?
It affects 1 product.
Products include Apache Struts.
How do I fix CVE-2026-104712?
No fix has been published for CVE-2026-104712 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-104712 being exploited?
There is no known exploitation of CVE-2026-104712 in the wild and no public exploit code.
Other vulnerabilities in Apache Struts
Sources
Also known as GHSA-8536-jvj9-v78f.