CVE-2026-104713: Apache Struts: Unbounded request body read in the REST plugin

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-05 · updated 2026-10-08
Weakness: CWE-770

Description

Allocation of resources without limits or throttling vulnerability in the Apache Struts REST plugin. A request body is read into memory without any bound on how much will be accepted, so a single request can cause the server to allocate memory in proportion to its size, exhausting the Java heap and denying service to other users. No additional setting has to be enabled. Applications that do not use the REST plugin are not affected. This issue affects Apache Struts: from 2.1.8 through 2.3.37, from 2.5.0 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.

Affected products

Apache Struts: from 2.1.8 through 2.3.37; from 2.5.0 through 2.5.33; from 6.0.0 before 6.12.0; from 7.0.0 before 7.4.0 — fixed in 6.12.0, 7.4.0

How to fix

Upgrade to a fixed version: Apache Struts 6.12.0, 7.4.0. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-104713 or the next vulnerability affects your stack