Threat Intelligence / CVE / CVE-2026-43512

CVE-2026-43512 — Apache Tomcat

CVSS v3.1 9.8 (CRITICAL) · EPSS 1.2% (higher than 65.5% of all scored CVEs) · Priority 9.5/10 · Published 2026-05-12

As of 2026-05-14, CVE-2026-43512 is a CRITICAL-severity vulnerability in Apache Tomcat, CVSS v3.1 9.8, EPSS 1.2% (65.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-43512, most recently “SAP July 2026 Patch Day: Critical Memory Corruption in NetWeaver ABAP (CVE-2026-44747, CVSS 9.9) Among 16 Security Notes”.

Last updated: 2026-05-14

What is CVE-2026-43512?

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication 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 before 7.0.0. Older unsupported versions any also be affect Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

The record classifies CVE-2026-43512 under weakness class CWE-592. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 124 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
1.2% probability of exploitation in the next 30 days, higher than 65.5% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
9.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-05-12, last modified 2026-05-14

Is CVE-2026-43512 being exploited?

Weaponised exploit code for CVE-2026-43512 is publicly available. 1 public proof-of-concept repository is tracked for this identifier.

Affected products and versions

Affected software packages:

How to fix CVE-2026-43512

Fixed versions are recorded for 9 packages: maven:org.apache.tomcat.embed:tomcat-embed-core 9.0.118, maven:org.apache.tomcat.embed:tomcat-embed-core 10.1.55, maven:org.apache.tomcat.embed:tomcat-embed-core 11.0.22, maven:org.apache.tomcat:tomcat 9.0.118, maven:org.apache.tomcat:tomcat 10.1.55, maven:org.apache.tomcat:tomcat 11.0.22, maven:org.apache.tomcat:tomcat-catalina 9.0.118, maven:org.apache.tomcat:tomcat-catalina 10.1.55, maven:org.apache.tomcat:tomcat-catalina 11.0.22. Vendor advisory: https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-43512

1 tracked threat in the Threadlinqs corpus references CVE-2026-43512, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Full detection coverage & IOCs for threats exploiting CVE-2026-43512 are available via the Threadlinqs MCP server (Purple tier). View plans →

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