Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete (CVE-2026-65637)
Description
An improper input validation vulnerability exists in Apache Tomcat due to an incomplete fix for CVE-2026-32990. This affects HTTP/2 no-authority handling, allowing bypass of strict Server Name Indication (SNI) validation. The vulnerability impacts Apache Tomcat versions 9.0.115 through 9.0.120, 10.1.53 through 10.1.57, and 11.0.20 through 11.0.24. Users are advised to upgrade to versions 9.0.121, 10.1.58, or 11.0.25 where the issue is fixed.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-65637 is an improper input validation vulnerability in Apache Tomcat that arises from an incomplete fix of a previous vulnerability (CVE-2026-32990). It specifically involves HTTP/2 no-authority requests bypassing strict SNI validation, which could lead to security policy bypasses. The affected versions are 9.0.115 to 9.0.120, 10.1.53 to 10.1.57, and 11.0.20 to 11.0.24. The vendor has released fixed versions 9.0.121, 10.1.58, and 11.0.25 to address this issue.
Potential Impact
The vulnerability allows bypassing strict SNI validation in HTTP/2, which could undermine security controls relying on SNI for domain validation. This may lead to improper handling of TLS connections or unauthorized access under certain configurations. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
A patch is available. Users should upgrade Apache Tomcat to versions 9.0.121, 10.1.58, or 11.0.25 or later to fully remediate this vulnerability. No other mitigation steps are specified or required beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-f525-44xv-f2qj
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-65637"]
- State
- PUBLISHED
Threat ID: 6a8efff4acd9273b4908ca43
Added to database: 08/26/2026, 15:02:12 UTC
Last enriched: 09/08/2026, 15:01:53 UTC
Last updated: 10/10/2026, 18:48:21 UTC
Views: 68
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