Vulnerability details
CVE-2026-78437
Apache Software Foundation Apache Tomcat
Apache Tomcat: HTTP/2 DoS via malformed request
CVSS 3.1
7.3High
Official description
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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.3High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 10.1.53 ≤ v ≤ 10.1.59 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Tomcat | 11.0.19 ≤ v ≤ 11.0.25 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Tomcat | 9.0.116 ≤ v ≤ 9.0.121 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-09-23
- Last updated
- 2026-09-23
- State
- Published
- Assigner (CNA)
- apache
Exploit prediction (EPSS)
0.51%
Probability of exploitation in 30 days
43.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-459Incomplete cleanup