Summary
It was discovered that Tomcat did not properly limit the size of
WebDAV LOCK and PROPFIND request bodies. A remote attacker could
possibly use this issue to cause Tomcat to consume excessive memory,
resulting in a denial of service. (CVE-2026-41284)
It was discovered that Tomcat incorrectly validated HTTP/2 header
fields. A remote attacker could use this issue to cause Tomcat to
crash or possibly execute arbitrary code. (CVE-2026-41293)
It was discovered that Tomcat did not properly clear HTTP
authentication headers during WebSocket connection upgrades and
redirects. A remote attacker could possibly use this issue to obtain
sensitive credentials. (CVE-2026-42498)
It was discovered that Tomcat incorrectly handled authorization
when multiple method constraints defined the same HTTP method. A
remote attacker could possibly use this issue to bypass
authorization restrictions. (CVE-2026-43515)
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · Pro 26.04 LTS Pro:26.04:LTS | tomcat11 | 11.0.18-1ubuntu0.1~esm1 |
Vulnerabilities 4
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Critical 9.8CVE-2026-41293 Public exploit
Apache Tomcat: HTTP/2 request headers not validated
Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27. Older, end of support versions may also …
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Critical 9.1CVE-2026-43515 Public exploit
Apache Tomcat: Security constraints not correctly applied
Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.11…
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High 7.5
Apache Tomcat: Unbounded read in WebDAV LOCK and PROPFIND handling
Allocation of Resources Without Limits or Throttling vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117. Older, unsupported versions may also be affec…
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High 7.3
Apache Tomcat: WebSocket authentication header exposure
Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.2…