CVE-2026-73635

Apache Struts: Unbounded growth of localized-text caches driven by the request locale

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.

Scores

Weaknesses (CWE)

• CWE-770

European references

• ENISA EUVD · EUVD-2026-59604
• GCVE · GCVE-0-2026-73635

CERT-FR advisories

• CERTFR-2026-AVI-1256 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:* ≥ 2.0.0 ≤ 2.3.37
• cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:* ≥ 2.5.0 ≤ 2.5.33
• cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:* ≥ 6.0.0 < 6.11.0
• cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:* ≥ 7.0.0 < 7.3.0

Affected products

References

• https://cwiki.apache.org/confluence/display/WW/S2-074

Sources