How severe is CVE-2026-43515?

CVE-2026-43515 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-43515 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-43515?

CVE-2026-43515 affects Apache Tomcat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-43515?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-43515 have an EU (EUVD) identifier?

Yes. CVE-2026-43515 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29519.

When was CVE-2026-43515 published?

CVE-2026-43515 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-43515

CVE-2026-43515 is a critical-severity vulnerability in Apache Tomcat with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29519
Weakness: CWE-285
Affected product: Apache Tomcat
Published: 2026-05-12
Last modified: 2026-06-17

Description

Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension 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 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Frequently asked questions

What is CVE-2026-43515?: Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension 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 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.
How severe is CVE-2026-43515?: CVE-2026-43515 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-43515 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-43515?: CVE-2026-43515 affects Apache Tomcat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-43515?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-43515 have an EU (EUVD) identifier?: Yes. CVE-2026-43515 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29519.
When was CVE-2026-43515 published?: CVE-2026-43515 was published on 2026-05-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

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