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CVE-2026-43515

📛 CVE Title

Apache Tomcat: Security constraints not correctly applied

⬇ Download JSON ⚠ View as Threat

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.

Overview

State
PUBLISHED
Assigner (CNA)
apache
CVSS severity
critical
CVSS score
CVSS 9.1 / 10 9.1 9.1 / 10
CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Effective score
9.1 / 10 CRITICAL source: CNA overview
CWE(s)
CWE-285
Reserved
2026-05-01
Published
2026-05-12 17:33 UTC
Last updated
2026-05-14 21:53 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43515.json
Linked Threat
CVE-2026-43515 — CVE-2026-43515

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-12 16:16:18 UTC
NVD last modified
2026-05-15 15:52:05 UTC
NVD CVSS v3.1
CVSS 9.1 / 10 9.1 9.1 / 10 CRITICAL source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploitability subscore
3.9 / 10
Impact subscore
5.2 / 10
EPSS score
0.0009 (probability of exploitation in next 30 days)
EPSS percentile
26.20% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 08:50 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-29519
Assigner
apache
Published
May 12, 2026, 3:33:23 PM
Updated
May 14, 2026, 7:53:24 PM
EUVD base score (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
EUVD-reported EPSS
0.1000
Vendors
Apache Software Foundation
Products
Apache Tomcat (10.1.0-M1 ≤10.1.54)
Apache Tomcat (8.5.0 ≤8.5.100)
Apache Tomcat (11.0.0-M1 ≤11.0.21)
Apache Tomcat
Apache Tomcat (7.0.0 ≤7.0.109)
Apache Tomcat (9.0.0.M1 ≤9.0.117)

ENISA 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.

EUVD references (1)

Affected products (1)
VendorProductVersionsPlatforms
Apache Software Foundation Apache Tomcat 11.0.0-M1 (affected), 10.1.0-M1 (affected), 9.0.0.M1 (affected), 8.5.0 (affected), 7.0.0 (affected), 0 (unknown) —

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

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

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (10)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (14)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...
    web:cybersecuritynews.com

    Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...

    2026-05-23 20:57 UTC
  • Apache Tomcat - Security constraints not correctly applied
    web:github.com

    This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS). Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability. Attack complexity: More severe for the ...

    2026-05-23 20:57 UTC
  • Patch Tuesday, May 2026 Edition - Krebs on Security
    web:krebsonsecurity.com

    Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

    2026-05-23 20:57 UTC
  • Nvd - Cve-2026-43515
    web:nvd.nist.gov

    An official website of the United States government NVD MENU

    2026-05-23 20:57 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 20:57 UTC
  • CVE-2026-43515: Apache Tomcat Security Constraints Misapplication ...
    web:vulert.com

    CVE-2026-43515 is a critical vulnerability in Apache Tomcat affecting multiple versions. Upgrade to patched versions to ensure application security.

    2026-05-23 20:57 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-05-23 20:57 UTC
  • Oracle Critical Patch Update Advisory - April 2026
    web:www.oracle.com

    This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-05-23 20:57 UTC
  • Vulnerability Remediation vs. Mitigation: What are the Differences ...
    web:www.secure.com

    Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.

    2026-05-23 20:57 UTC
  • Patch Tuesday May 2026: Security Updates & CVE Analysis
    web:zecurit.com

    Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-05-23 20:57 UTC
  • Microsoft and Adobe Patch Tuesday, April 2026 Security Update Review
    web:blog.qualys.com

    With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.

    2026-05-26 02:53 UTC
  • CVE-2026-43515 : Improper Authorization Vulnerability in Apache Tomcat ...
    web:securityvulnerability.io

    What is CVE-2026-43515 ? An improper authorization vulnerability has been identified in Apache Tomcat, where multiple method constraints may define an HTTP method for the same extension. This flaw can potentially allow unauthorized access and manipulation of resources within the affected versions of Apache Tomcat, making it imperative for users running vulnerable releases to upgrade to the ...

    2026-05-26 02:53 UTC
  • March 23, 2026—Hotpatch KB5085518 (OS Builds 26200.7985 and 26100.7985 ...
    web:support.microsoft.com

    This out-of-band update for Windows 11, version 25H2 and 24H2 (KB5085518) includes fixes and improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates ...

    2026-05-26 02:53 UTC
  • A guide to vulnerability remediation vs mitigation | @Bugcrowd
    web:www.bugcrowd.com

    Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.

    2026-05-26 02:53 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43515.json.

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