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High severity · published Aug 15, 2026
CVE-2026-73635
Apache Struts: Unbounded growth of localized-text caches driven by the request locale
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ST
Struts · Apache
2.0.0 through 2.3.37; 2.5.0 through 2.5.33; 6.0.0 through 6.10.0; 7.0.0 through 7.2.1 · source: vendor, NVD
Affected product
ST
Struts
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73635
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73635
Vendor Advisory
https://cwiki.apache.org/confluence/display/WW/S2-074
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