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CVE-2026-43513

📛 CVE Title

Apache Tomcat: LockOutRealm treats user names as case-sensitive

⬇ Download JSON ⚠ View as Threat

Description

Improper Handling of Case Sensitivity vulnerability in LockOutRealm 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. Older unsupported versions may also be affected. 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
high
CVSS score
CVSS 7.5 / 10 7.5 7.5 / 10
CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Effective score
7.5 / 10 HIGH source: CNA overview
CWE(s)
CWE-178
Reserved
2026-05-01
Published
2026-05-12 17:26 UTC
Last updated
2026-05-14 21:53 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/43xxx/CVE-2026-43513.json
Linked Threat
CVE-2026-43513 — CVE-2026-43513

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 15:53:14 UTC
NVD CVSS v3.1
CVSS 7.5 / 10 7.5 7.5 / 10 HIGH 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:N/A:N
Exploitability subscore
3.9 / 10
Impact subscore
3.6 / 10
EPSS score
0.0008 (probability of exploitation in next 30 days)
EPSS percentile
23.84% 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-2026-29517
Assigner
apache
Published
May 12, 2026, 3:26:25 PM
Updated
May 14, 2026, 7:53:30 PM
EUVD base score (CVSS 3.1)
7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EUVD-reported EPSS
0.0800
Vendors
Apache Software Foundation
Products
Apache Tomcat (11.0.0-M1 ≤11.0.21)
Apache Tomcat (7.0.0 ≤7.0.109)
Apache Tomcat (10.1.0-M1 ≤10.1.54)
Apache Tomcat (9.0.0.M1 ≤9.0.117)
Apache Tomcat (8.5.0 ≤8.5.100)
Apache Tomcat

ENISA description: Improper Handling of Case Sensitivity vulnerability in LockOutRealm 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. Older unsupported versions may also be affected. 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.

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-43513.json.

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