Medium [CVE-2026-55955] Replay attack via improper authentication in EncryptionInterceptor
This medium-severity Red Hat Linux advisory covers CVE-2026-55955 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.
Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue. This could lead to unauthorized access or manipulation of data within the cluster component.
A flaw was found in Apache Tomcat's EncryptionInterceptor used for Tribes cluster communication. Exploitation requires the EncryptionInterceptor to be configured for Tomcat clustering, which is a non-default configuration, and the attacker must have access to the cluster network to capture and replay messages.
Apache rates this vulnerability as Low severity. Red Hat has corrected the impact from IMPORTANT to MODERATE — the original AI-Bot CVSS of 8.2 (AV:N/AC:L) incorrectly scored this as internet-facing with low complexity, when Tribes cluster traffic is adjacent-network (AV:A) and requires non-default clustering configuration (AC:H).
Weakness: CWE-294. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat JBoss Web Server 5.
- 11.0.0
- 11.0.22
- 10.1.0
- 10.1.55
- 9.0.13
- 9.0.18
- 8.5.38
- 8.5.100
- 7.0.100
- 7.0.109
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- 11.0.23
- 10.1.56
- 9.0.119
- tomcat10-main-10.1.56-1.hum1
- tomcat11-main-11.0.23-0.1.hum1
- RHSA-2026:29203
- RHSA-2026:32960
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- This vulnerability only affects Tomcat deployments using the EncryptionInterceptor for Tribes cluster communication. Deployments that do not use Tomcat clustering or do not configure the EncryptionInterceptor are not affected. Ensure cluster communication channels are restricted to trusted, isolated networks.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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