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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://cwiki.apache.org/confluence/display/WW/S2-077 Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · apacheNVD modified 2026-10-08 19:15
Affected (CPE criteria) 1
cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
References 2
- https://cwiki.apache.org/confluence/display/WW/S2-077 Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/10/05/12 Mailing List, Third Party Advisory