Medium [CVE-2026-65637] Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation
This medium-severity Red Hat Linux advisory covers CVE-2026-65637 affecting Red Hat JBoss Web Server 5, Red Hat JBoss Web Server 6, Red Hat JBoss Web Server 7.
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Summary
Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue. This could potentially lead to unauthorized access or misrouting of requests.
This Moderate flaw in Apache Tomcat allows an HTTP/2 no-authority bypass of strict Server Name Indication (SNI) validation due to improper input handling. This could lead to requests being misrouted to an unintended virtual host, potentially exposing sensitive information or causing service disruption in specific configurations.
The impact is limited as it primarily affects request routing rather than arbitrary code execution. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-444. Affected Red Hat products: Red Hat JBoss Web Server 5; Red Hat JBoss Web Server 6; Red Hat JBoss Web Server 7.
Under investigation: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images. Will not fix / out of support: Red Hat JBoss Web Server 5.
Red Hat does not currently list a fixing RHSA for this CVE.
- 11.0.20
- 11.0.24
- 10.1.53
- 10.1.57
- 9.0.115
- 9.0.120
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- 11.0.25
- 10.1.58
- 9.0.121
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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