Summary
Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.
Security Fix(es):
* tomcat: Apache Tomcat: Security constraint bypass due to improper access control (CVE-2026-65182)
* tomcat: Apache Tomcat: Access control bypass due to off-by-one error in RewriteValve [N] flag processing (CVE-2026-65927)
* tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation (CVE-2026-65637)
* tomcat: Apache Tomcat: Improper Authentication due to principal lookup failure (CVE-2026-68569)
* tomcat: Apache Tomcat: Authentication bypass via limited replay attack in DIGEST authenticator (CVE-2026-65905)
* tomcat: Apache Tomcat: Unauthorized resource access via FORM authentication bypass (CVE-2026-68525)
* tomcat: Apache Tomcat: Denial of Service via HTTP/2 allocation leak (CVE-2026-68763)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 8
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | tomcat | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-admin-webapps | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-docs-webapp | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-el-3.0-api | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-jsp-2.3-api | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-lib | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-servlet-4.0-api | 1:9.0.121-1.el9_8 |
| AlmaLinux · 9 | tomcat-webapps | 1:9.0.121-1.el9_8 |
Vulnerabilities 7
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Critical 9.8
Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete
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 …
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Critical 9.8
Apache Tomcat: Limited replay attack possible with DIGEST authentication
Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before windowSize requests have been made, a client makes a DIGEST authenticated request with a nonceCount on the upper boundary of the replay window then that …
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Critical 9.1
Apache Tomcat: Bypass longest prefix security constraint
Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path. This issue affects Apache Tomcat: f…
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Critical 9.1
Apache Tomcat: Redirect after FORM auth may bypass method specific constraints
Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a security constraint that limits user has access to a resource POST but not GET. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, fr…
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High 8.1
Apache Tomcat: Principal lookup can fail open in some cases
Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPNEGO) that a user would be authenticated even if the user did not exist in the DataSourceRealm. This issue affects Apache Tomcat: from 11.0.0-M1 throu…
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High 7.5
Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 t…
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High 7.5
Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset
Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through…
References
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report
https://access.redhat.com/security/cve/CVE-2026-65182
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report
https://access.redhat.com/security/cve/CVE-2026-65637
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report
https://access.redhat.com/security/cve/CVE-2026-65905
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report
https://access.redhat.com/security/cve/CVE-2026-65927
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report
https://access.redhat.com/security/cve/CVE-2026-68525
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report
https://access.redhat.com/security/cve/CVE-2026-68569
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report
https://access.redhat.com/security/cve/CVE-2026-68763
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report
https://bugzilla.redhat.com/2524151
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report
https://bugzilla.redhat.com/2524154
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report
https://bugzilla.redhat.com/2524155
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report
https://bugzilla.redhat.com/2524160
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report
https://bugzilla.redhat.com/2524161
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report
https://bugzilla.redhat.com/2524162
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report
https://bugzilla.redhat.com/2524166
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advisory
https://errata.almalinux.org/9/ALSA-2026-93469.html