CVE-2026-78437Apache Tomcat: HTTP/2 DoS via malformed request
Updated under an hour ago ()
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It affects Apache Software Foundation Apache Tomcat. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.3 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-459
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- apache
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache Tomcat apache_software_foundation:apache_tomcat (from the name) | from 11.0.19 through 11.0.25; from 10.1.53 through 10.1.59; from 9.0.116 through 9.0.121; through 8.5.100 not affected | CNA record |
References
- https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjgvendor-advisory
- http://www.openwall.com/lists/oss-security/2026/09/23/26
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.