SB2026103001 - Red Hat Enterprise Linux 9 update for tomcat
Published: October 30, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Improper access control (CVE-ID: CVE-2026-65182)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass security constraints.
The vulnerability exists due to improper access control in security constraint processing when handling requests for paths with overlapping constraints. A remote attacker can send a crafted request to bypass security constraints.
The issue occurs if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path.
2) Off-by-one (CVE-ID: CVE-2026-65927)
CWE-ID: CWE-193 - Off-by-one Error
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass access control.
The vulnerability exists due to an off-by-one error in RewriteValve when processing rewrite rules that use the [N] flag. A remote attacker can trigger rewrite processing to restart at the second rule instead of the first rule to bypass access control.
3) Improper access control (CVE-ID: CVE-2026-65637)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass strict SNI validation.
The vulnerability exists due to improper access control in the HTTP/2 request handling when processing requests without an authority field. A remote attacker can send a specially crafted HTTP/2 request to bypass strict SNI validation.
The issue is related to an incomplete fix for a previous vulnerability.
4) Improper Authentication (CVE-ID: CVE-2026-68569)
CWE-ID: CWE-287 - Improper Authentication
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to bypass authentication.
The vulnerability exists due to improper authentication in DataSourceRealm and JDBCRealm when processing principal lookups for certain authentication methods. A remote user can authenticate with CLIENT-CERT or SPNEGO even if the user does not exist in the configured realm to bypass authentication.
The issue affects some authentication methods, including CLIENT-CERT and SPNEGO.
5) Authentication Bypass by Capture-replay (CVE-ID: CVE-2026-65905)
CWE-ID: CWE-294 - Authentication Bypass by Capture-replay
CVSSv4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to replay a DIGEST-authenticated request once.
The vulnerability exists due to improper authentication in DIGEST authentication replay protection when processing a DIGEST-authenticated request with a nonceCount on the upper boundary of the replay window before windowSize requests had been made. A remote user can send and replay a crafted DIGEST-authenticated request to replay a DIGEST-authenticated request once.
The issue only occurs while the associated nonceCount remains within the replay window.
6) Improper access control (CVE-ID: CVE-2026-68525)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to bypass method-specific access controls.
The vulnerability exists due to improper access control in the FORM authentication process when handling a redirect after authentication. A remote user can complete FORM authentication and use the redirect flow to bypass method-specific access controls.
The issue affects constraints that restrict access to a resource for POST requests but not GET requests.
7) Memory leak (CVE-ID: CVE-2026-68763)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an allocation leak in HTTP/2 backlog tracking when processing a reset stream. A remote attacker can reset a stream to cause a denial of service.
Remediation
Install update from vendor's website.