Apache Tomcat vulnerabilities: known CVEs & security history
Apache · Web / Runtime · 13 tracked CVEs · 1 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Apache Tomcat release lines — 13 in total, with 1 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Apache Tomcat's current status and the safe version to run.
Known Apache Tomcat CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2017-12615⚡ exploited | high | 8.1 | 100% | 2017 |
| CVE-2026-59084 | critical | 9.1 | 0% | 2026 |
| CVE-2026-59083 | critical | 9.1 | 0% | 2026 |
| CVE-2026-55276 | critical | 9.1 | 0% | 2026 |
| CVE-2026-53434 | critical | 9.1 | 0% | 2026 |
| CVE-2026-34486 | high | 7.5 | 22% | 2026 |
| CVE-2026-29146 | high | 7.5 | 5% | 2026 |
| CVE-2026-24734 | high | 7.5 | 0% | 2026 |
| CVE-2026-55957 | high | 7.3 | 0% | 2026 |
| CVE-2026-53404 | high | 7.3 | 0% | 2026 |
| CVE-2026-55956 | medium | 6.5 | 0% | 2026 |
| CVE-2026-55955 | medium | 6.5 | 0% | 2026 |
| CVE-2026-50229 | medium | 6.1 | 0% | 2026 |
Is my Apache Tomcat version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Apache Tomcat version → · Monitor Apache Tomcat for new CVEs →
Apache Tomcat vulnerabilities — frequently asked
How many known vulnerabilities does Apache Tomcat have?
IsItPatched tracks 13 CVEs for Apache Tomcat, 1 of which is actively exploited (CISA KEV). 4 are critical-severity and 6 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Apache Tomcat have any actively-exploited vulnerabilities?
Yes — 1 Apache Tomcat CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild (1 linked to ransomware). Patch it as a priority.
What is the most severe Apache Tomcat vulnerability?
Among tracked issues, CVE-2017-12615 (HIGH, CVSS 8.1), which is actively exploited, ranks highest — a Unrestricted file upload weakness.
Is Apache Tomcat safe to use?
It depends on the version. The latest supported Apache Tomcat release (11.0.24) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Apache Tomcat security status · Apache Tomcat end-of-life · actively-exploited CVEs. Always verify against Apache's advisories — see our disclaimer.