Denial of service via out of memory (OOM) owing to no sanity limit on normal form fields in multipart forms. When a Multipart request has non-file normal form fields, Struts used to bring them into memory as Strings without checking their sizes. This could lead to an OOM if developer has set struts.multipart.maxSize to a value equal or greater than the available memory.

Upgrade to Struts 2.5.31 or 6.1.2.1 or greater

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-34396
• https://cwiki.apache.org/confluence/display/WW/S2-064
• apache/struts@2d6f1bc
• https://github.com/apache/struts/releases/tag/STRUTS_2_5_31
• https://github.com/apache/struts/releases/tag/STRUTS_6_1_2_1
• http://www.openwall.com/lists/oss-security/2023/06/14/3
• https://security.netapp.com/advisory/ntap-20230706-0005/