Is CVE-2026-53434 in the CISA KEV catalog?

No. CVE-2026-53434 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-53434?

CVE-2026-53434 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2026-53434?

CVE-2026-53434 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53434?

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

CVE & CISA-KEV Catalog

CVE-2026-53434

CRITICAL

9.1

CVSS v3

NVD

Description

Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connector. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through 10.1.55, from 9.0.83 through 9.0.118. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fixes the issue.

CWE-390

How to fix

Remediation Available

tomcat10Red Hat / RHEL

Fixed in:main@srcRHSA-2026:29203

Fixed in:main@noarchRHSA-2026:29203

tomcat10Rocky

Fixed in:main@srcRHSA-2026:29203

Fixed in:main@noarchRHSA-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

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-390 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-30255	Medium	5.3	88%	-	Fix
CVE-2024-27919	High	7.5	87%	-	-
CVE-2025-26465	Medium	6.8	7.4%	-	Fix
CVE-2019-5051	High	8.8	4.0%	-	Fix
CVE-2021-40391	Critical	9.8	2.9%	-	Fix
CVE-2017-7485	Medium	5.9	2.0%	-	-

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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 2026-07-02.