Apache Struts prior 6.11.0/7.3.0 Localized-Text Cache allocation of resources

Summaryinfo

A vulnerability classified as problematic has been found in Apache Struts. This affects an unknown function of the component Localized-Text Cache. Performing a manipulation results in allocation of resources. This vulnerability is known as CVE-2026-73635. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Apache Struts. This affects some unknown processing of the component Localized-Text Cache. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. The summary by CVE is:

Allocation of resources without limits or throttling vulnerability in Apache Struts. When no fixed locale is configured, the locale used for localized-text lookups is taken from the incoming request, allowing an unauthenticated remote client to cause the framework's internal localized-text caches to grow without bound and exhaust the Java heap, denying service to other users. Applications that configure a fixed locale are not affected. This issue affects Apache Struts: from 2.0.0 through 2.3.37, from 2.5.0 through 2.5.33, from 6.0.0 through 6.10.0, from 7.0.0 through 7.2.1. Users are recommended to upgrade to version 6.11.0 or 7.3.0, which fixes the issue.

The advisory is shared at cwiki.apache.org. This vulnerability is uniquely identified as CVE-2026-73635 since 08/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 6.11.0 or 7.3.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-2848). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Apache Struts

Productinfo

Type

• Programming Tool Software

Vendor

• Apache

Name

• Struts

License

• open-source

Website

• Vendor: https://www.apache.org/

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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