CVE-2026-55955

Apache Tomcat: EncryptInterceptor not protected against replay attacks

Description

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.

Scores

Weaknesses (CWE)

• CWE-287

European references

• ENISA EUVD · EUVD-2026-40231
• GCVE · GCVE-0-2026-55955

CERT-FR advisories

• CERTFR-2026-AVI-1094 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-0817 — Multiples vulnérabilités dans Apache Tomcat · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* < 9.0.119
• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 10.1.0 < 10.1.56
• cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* ≥ 11.0.0 < 11.0.23

Affected products

References

• https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54yd64s106
• http://www.openwall.com/lists/oss-security/2026/06/29/24

Sources