CVE-2026-73635: Red Hat Denial of Service via unbounded localized-text caches
This Red Hat advisory covers CVE-2026-73635.
Key facts
- Vendor rating
- High, CVSS 7.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- 2.0.0; 2.3.37; 2.5.0 and 5 more below
- Fixed in
- 6.11.0, 7.3.0
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
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.
Users are recommended to upgrade to version 6.11.0 or 7.3.0, which fixes the issue. This can lead to the exhaustion of Java heap memory, resulting in a Denial of Service (DoS) for other users.
An uncontrolled resource consumption flaw exists in the Apache Struts localized-text lookup caching mechanism. An unauthenticated remote attacker can exploit this by streaming requests with arbitrary, unique locale parameters, exhausting JVM heap space and causing a denial of service.
The impact is limited to process availability. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Fuse 7 as not affected.
Text from the source record.
- 2.0.0
- 2.3.37
- 2.5.0
- 2.5.33
- 6.0.0
- 6.10.0
- 7.0.0
- 7.2.1
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-73635
Upgrade to a fixed release named by Red Hat:
- 6.11.0
- 7.3.0
Vendor guidance
- Configure a fixed default locale in `struts.xml` by setting the `struts.locale` property (e.g., `<constant name="struts.locale" value="en_US" />`). Alternatively, configure an API gateway or web application firewall (WAF) to sanitize or strip non-standard `Accept-Language` headers before forwarding traffic to the application.
CVE-2026-73635 in other vendors' advisories
- Apache: CVE-2026-73635, high severity, fixed in 6.11.0, 7.3.0
- Atlassian: CVE-2026-73635, high severity, fixed in Crowd Data Center and Server: 7.2.4 recommended Data Center Only
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