What’s Vulnerable › Vulnerabilities

CVE-2023-41835: Apache Struts: excessive disk usage

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-12-05 · updated 2026-06-17
• Weakness: CWE-459

Description

When a Multipart request is performed but some of the fields exceed the maxStringLength  limit, the upload files will remain in struts.multipart.saveDir  even if the request has been denied. Users are recommended to upgrade to versions Struts 2.5.32 or 6.1.2.2 or Struts 6.3.0.1 or greater, which fixe this issue.

Affected products

• Apache Struts: from 2.0.0 before 2.5.32; from 6.1.2.1 before 6.3.0.1 — fixed in 2.5.32, 6.3.0.1

How to fix

Upgrade to a fixed version: Apache Struts 2.5.32, 6.3.0.1. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/6wj530kh3ono8phr642y9sqkl67ys2ft
• https://www.openwall.com/lists/oss-security/2023/12/09/1
• https://lists.apache.org/thread/6wj530kh3ono8phr642y9sqkl67ys2ft
• https://security.netapp.com/advisory/ntap-20231013-0001/
• https://www.openwall.com/lists/oss-security/2023/12/09/1

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