[UPDATE] [high] Apache Tomcat: Multiple vulnerabilities

highCVE-2026-41284 CVE-2026-41293 CVE-2026-42498 CVE-2026-43512 CVE-2026-43513 CVE-2026-43514

An attacker can exploit multiple vulnerabilities in Apache Tomcat to bypass security measures, disclose confidential information, manipulate data, trigger a Denial-of-Service condition, or conduct other unspecified attacks.

CSIRTS triage

vendor: Apache product: Tomcat Authentication bypass Information disclosure Denial of serviceOther

What: An attacker can exploit multiple vulnerabilities in Apache Tomcat to bypass security measures, disclose confidential information, manipulate data, trigger a Denial-of-Service condition, or conduct other unspecified attacks.
Who is affected: Deployments of Apache Tomcat.
Urgency: Remediation is high urgency due to the variety of potential attacks.
Action: Apply patches as they become available.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-12
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1514

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-412840.78% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 53% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-412931.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 73% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-424980.60% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 46% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-435121.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 66% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-435130.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-435140.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-435151.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 64% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-41284	coverage & exploitation status	NVD · CVE.org
CVE-2026-41293	coverage & exploitation status	NVD · CVE.org
CVE-2026-42498	coverage & exploitation status	NVD · CVE.org
CVE-2026-43512	coverage & exploitation status	NVD · CVE.org
CVE-2026-43513	coverage & exploitation status	NVD · CVE.org
CVE-2026-43514	coverage & exploitation status	NVD · CVE.org
CVE-2026-43515	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownNCSC-2026-0325 [1.00] [M/H] Vulnerabilities patched in Atlassian productsncsc-nl
highexploited[NEW] [high] Atlassian Products (Bamboo, Bitbucket, Confluence, Crucible, Fisheye, and Jira): Multiple vulnera…cert-bund
high[NEW] [high] Oracle Solaris third-party components: Multiple vulnerabilitiescert-bund
highexploited[UPDATE] [high] Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira and Jira Service Management: …cert-bund
unknownMultiple vulnerabilities in IBM products (August 07, 2026)cert-fr-avis
high[NEW] [high] SAP Patch Day July 2026cert-bund
unknownNCSC-2026-0230 [1.01] [M/H] Vulnerabilities fixed in SAP productsncsc-nl
unknownUSN-8551-1: Tomcat vulnerabilitiesubuntu
unknownMultiple vulnerabilities in SAP products (July 15, 2026)cert-fr-avis
unknownNCSC-2026-0230 [1.00] [M/H] Vulnerabilities fixed in SAP productsncsc-nl

Recent advisories for Apache Tomcat

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-73180: Insufficient Session Expiration vulnerability in Apache Tomcat meant that if the session ID fo…nvd · 2026-08-25
unknownCVE-2026-68763: Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the…nvd · 2026-08-25
unknownCVE-2026-68569: Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. …nvd · 2026-08-25
unknownCVE-2026-68525: Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows th…nvd · 2026-08-25
unknownCVE-2026-66422: Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions b…nvd · 2026-08-25
unknownCVE-2026-65927: Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves c…nvd · 2026-08-25