Advisory severityHigh7.3Apache Software Foundation

High [CVE-2026-78437] Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail

This high-severity Apache Software Foundation advisory covers CVE-2026-78437 affecting Apache Tomcat.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-78437 Source published Sep 23, 2026Source updated Sep 23, 2026

VulniPulse record published Sep 23, 2026Record updated Sep 23, 2026

CVE-2026-78437

Affected products & platforms

Apache Software FoundationTomcat

Open source advisory

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Summary

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.

This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Affected versions

11.0.19 through 11.0.25
10.1.53 through 10.1.59
9.0.116 through 9.0.121.
through 9.0.121

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions

11.0.26
10.1.60
9.0.122

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-78437 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-78437NVD CVE.org MITRE

Official resources

Apache Tomcat security bulletins (per major version) (target: 11.0.26 / 10.1.60 / 9.0.122)
Official documentation
This advisory names 11.0.26 / 10.1.60 / 9.0.122 as the first fixed releases — official upgrade documentation for Apache Tomcat security bulletins (per major version).
ASF Security — reporting & CVE process
Official documentation
The Apache Software Foundation's official security page: how ASF CVEs are published and where each project's advisories live.
Apache project downloads (fixed releases)
Official documentation
Official ASF download tree — fetch the fixed release named in this advisory from the project's directory.

Discussion(0)

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