# 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.

- Web page: https://patchblox.com/security/fix/linux/alas2023-2026-3166
- Platform: Linux
- Released: Nov 7, 2026
- Priority: Urgent (Closes CVE-2026-76183, rated Critical)
- CVEs: 12, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://alas.aws.amazon.com/AL2023/ALAS-2026-3166.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [tomcat9](https://patchblox.com/security/data/product/linux/tomcat9.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-admin-webapps](https://patchblox.com/security/data/product/linux/tomcat9-admin-webapps.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-docs-webapp](https://patchblox.com/security/data/product/linux/tomcat9-docs-webapp.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-el-3.0-api](https://patchblox.com/security/data/product/linux/tomcat9-el-3.0-api.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-jsp-2.3-api](https://patchblox.com/security/data/product/linux/tomcat9-jsp-2.3-api.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-lib](https://patchblox.com/security/data/product/linux/tomcat9-lib.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-servlet-4.0-api](https://patchblox.com/security/data/product/linux/tomcat9-servlet-4.0-api.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |
| [tomcat9-webapps](https://patchblox.com/security/data/product/linux/tomcat9-webapps.md) | amzn 2023 | 1:9.0.122-1.amzn2023.0.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-76183](https://patchblox.com/security/data/cve/CVE-2026-76183.md) | Urgent | tomcat9: Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSo... | 9.8 | 0.0057 |  |
| [CVE-2026-86248](https://patchblox.com/security/data/cve/CVE-2026-86248.md) | Urgent | tomcat9: CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in A... | 9.8 | 0.0050 |  |
| [CVE-2026-86350](https://patchblox.com/security/data/cve/CVE-2026-86350.md) | Urgent | tomcat9: Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat cau... | 9.1 | 0.0048 |  |
| [CVE-2026-77791](https://patchblox.com/security/data/cve/CVE-2026-77791.md) | High | tomcat9: Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a... | 7.5 | 0.0068 |  |
| [CVE-2026-87022](https://patchblox.com/security/data/cve/CVE-2026-87022.md) | High | tomcat9: Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling... | 7.5 | 0.0054 |  |
| [CVE-2026-75973](https://patchblox.com/security/data/cve/CVE-2026-75973.md) | High | tomcat9: Improper Authentication vulnerability in Apache Tomcat | 7.3 | 0.0052 |  |
| [CVE-2026-78437](https://patchblox.com/security/data/cve/CVE-2026-78437.md) | High | tomcat9: Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause... | 7.3 | 0.0051 |  |
| [CVE-2026-78383](https://patchblox.com/security/data/cve/CVE-2026-78383.md) | High | tomcat9: Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP req... | 7.5 | 0.0050 |  |
| [CVE-2026-77762](https://patchblox.com/security/data/cve/CVE-2026-77762.md) | High | tomcat9: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache T... | 8.1 | 0.0046 |  |
| [CVE-2026-79677](https://patchblox.com/security/data/cve/CVE-2026-79677.md) | High | tomcat9: Missing release of resource after effective lifetime, Comparison using wrong factors vulnerability in Apache Tomcat a... | 7.5 | 0.0042 |  |
| [CVE-2026-77756](https://patchblox.com/security/data/cve/CVE-2026-77756.md) | Routine | tomcat9: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat cause... | 3.7 | 0.0053 |  |
| [CVE-2026-73581](https://patchblox.com/security/data/cve/CVE-2026-73581.md) | Routine | tomcat10: Improper Check for Certificate Revocation vulnerability in Apache Tomcat | 6.5 | 0.0016 |  |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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