ALAS2023-2026-3166: Security update for 8 packages

ALAS2023-2026-3166, released November 7, 2026, fixes 12 CVEs across 8 products. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

3 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0068

52nd percentile

Priority of the 12 CVEs

Patch now 0
                                Urgent 3
                                High 7
                                Routine 2

Fixed package versions

Product	Release	Fixed in
tomcat9	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-admin-webapps	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-docs-webapp	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-el-3.0-api	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-jsp-2.3-api	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-lib	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-servlet-4.0-api	amzn 2023	1:9.0.122-1.amzn2023.0.1
tomcat9-webapps	amzn 2023	1:9.0.122-1.amzn2023.0.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-76183	tomcat9: Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSo...	9.8	0.0057	None reported
Urgent	CVE-2026-86248	tomcat9: CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in A...	9.8	0.0050	None reported
Urgent	CVE-2026-86350	tomcat9: Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat cau...	9.1	0.0048	None reported
High	CVE-2026-77791	tomcat9: Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a...	7.5	0.0068	None reported
High	CVE-2026-87022	tomcat9: Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling...	7.5	0.0054	None reported
High	CVE-2026-75973	tomcat9: Improper Authentication vulnerability in Apache Tomcat	7.3	0.0052	None reported
High	CVE-2026-78437	tomcat9: Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause...	7.3	0.0051	None reported
High	CVE-2026-78383	tomcat9: Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP req...	7.5	0.0050	None reported
High	CVE-2026-77762	tomcat9: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache T...	8.1	0.0046	None reported
High	CVE-2026-79677	tomcat9: Missing release of resource after effective lifetime, Comparison using wrong factors vulnerability in Apache Tomcat a...	7.5	0.0042	None reported
Routine	CVE-2026-77756	tomcat9: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat cause...	3.7	0.0053	None reported
Routine	CVE-2026-73581	tomcat10: Improper Check for Certificate Revocation vulnerability in Apache Tomcat	6.5	0.0016	None reported

Also fixes CVE-2026-76183

RHSA-2026:93618
jws7-mod_cluster, jws7-tomcat, jws7-tomcat-native on RHEL 10
ALAS2023-2026-3151
tomcat11, tomcat11-admin-webapps, tomcat11-docs-webapp and 5 more on amzn 2023
SUSE-SU-2026:4546-1
tomcat, tomcat10 on sles 15.6, sles 15.7
SUSE-SU-2026:4544-1
libtcnative-1-0, tomcat11 on sles 15.6, sles 15.7
OPENSUSE-SU-2026:21984-1
libtcnative-1-0, libtcnative-2-0, tomcat and 2 more on opensuse-leap 16.0
SUSE-SU-2026:23985-1
libtcnative-1-0, libtcnative-2-0, tomcat and 2 more on sles 16.0
ALAS2023-2026-3165
tomcat10, tomcat10-admin-webapps, tomcat10-docs-webapp and 5 more on amzn 2023
DEBIAN-CVE-2026-76183
tomcat10, tomcat9 on Debian 12.15 (bookworm), Debian 13.5 (trixie), Debian 14

Vendor advisory

https://alas.aws.amazon.com/AL2023/ALAS-2026-3166.html

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