CVE-2026-43515

Name: CVE-2026-43515
Creator: NVD / NIST
Published: 2026-05-12T16:16:18.553+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2026-43515 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

0.84%

53.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-285

Affected Software

Vendor	Product	Versions
Apache	Tomcat	>= 7.0.0, <= 7.0.109
Apache	Tomcat	>= 8.5.0, <= 8.5.100
Apache	Tomcat	>= 9.0.0, < 9.0.118
Apache	Tomcat	>= 10.1.0, < 10.1.55
Apache	Tomcat	>= 11.0.0, < 11.0.22

References

https://lists.apache.org/thread/746nxfxod0wsocxtmv8pb8nkgmwpc6bbMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/12/11Mailing List, Third Party Advisory

Timeline

Published: May 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-43515?

How severe is CVE-2026-43515?

CVE-2026-43515 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43515?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43515?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST