CVE-2026-43512

Description

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0. Older unsupported versions any also be affect Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
tomcat6	26.10 stonking	Not in release
	26.04 LTS resolute	Not in release
	25.10 questing	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Fixed in 6.0.39-1ubuntu0.1+esm3
tomcat7	26.10 stonking	Not in release
	26.04 LTS resolute	Not in release
	25.10 questing	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Fixed in 7.0.68-1ubuntu0.4+esm4
	14.04 LTS trusty	Fixed in 7.0.52-1ubuntu0.16+esm2
tomcat8	26.10 stonking	Not in release
	26.04 LTS resolute	Not in release
	25.10 questing	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable
tomcat9	26.10 stonking	Not affected
	26.04 LTS resolute	Fixed in 9.0.115-1ubuntu0.1
	25.10 questing	Fixed in 9.0.95-1ubuntu1.1
	24.04 LTS noble	Fixed in 9.0.70-2ubuntu0.1+esm3
	22.04 LTS jammy	Fixed in 9.0.58-1ubuntu0.2+esm4
	20.04 LTS focal	Fixed in 9.0.31-1ubuntu0.9+esm3
	18.04 LTS bionic	Fixed in 9.0.16-3ubuntu0.18.04.2+esm8
tomcat10	26.10 stonking	Not affected
	26.04 LTS resolute	Fixed in 10.1.40-1ubuntu1.26.04.1
	25.10 questing	Fixed in 10.1.40-1ubuntu1.25.10.1
	24.04 LTS noble	Fixed in 10.1.16-1ubuntu0.1~esm4
	22.04 LTS jammy	Not in release
tomcat11	26.10 stonking	Not affected
	26.04 LTS resolute	Vulnerable
	25.10 questing	Ignored end of life, was needed
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release

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Notes

ebarretto

xenial tomcat6 only builds libservlet2.5-java, not the Tomcat server binaries bionic tomcat7 only builds libservlet3.0-java, not the Tomcat server binaries

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
tomcat6	Upstream: 6565a6c
tomcat7	Upstream: 6565a6c

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.8 · Critical
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-8383-1
Tomcat vulnerabilities
4 June 2026

USN-8417-1
Tomcat vulnerabilities
10 June 2026