Is CVE-2026-55955 in the CISA KEV catalog?

No. CVE-2026-55955 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-55955?

CVE-2026-55955 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-55955?

CVE-2026-55955 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-55955?

Upgrade tomcat10 on rhel 8 to main@noarch or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2026-55955

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-287Improper Authentication

How to fix

Remediation Available

tomcat10Red Hat / RHEL

Fixed in:main@noarchRHSA-2026:29203

Fixed in:main@srcRHSA-2026:29203

tomcat10Rocky

Fixed in:main@noarchRHSA-2026:29203

Fixed in:main@srcRHSA-2026:29203

tomcat11Red Hat / RHEL

Fixed in:main@noarchRHSA-2026:32960

Fixed in:main@srcRHSA-2026:32960

tomcat11Rocky

Fixed in:main@noarchRHSA-2026:32960

Fixed in:main@srcRHSA-2026:32960

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-30.