USN-8450-1

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)

References

Affected packages

Ubuntu:Pro:26.04:LTS / tomcat11

Package

Name: tomcat11
Purl: pkg:deb/ubuntu/tomcat11?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

11.0.18-1ubuntu0.1~esm1

Affected versions

11.*

11.0.6-1

11.0.11-1

11.0.15-1

11.0.18-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libtomcat11-embed-java",
            "binary_version": "11.0.18-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "libtomcat11-java",
            "binary_version": "11.0.18-1ubuntu0.1~esm1"
        },
        {
            "binary_version": "11.0.18-1ubuntu0.1~esm1",
            "binary_name": "tomcat11"
        },
        {
            "binary_name": "tomcat11-admin",
            "binary_version": "11.0.18-1ubuntu0.1~esm1"
        },
        {
            "binary_version": "11.0.18-1ubuntu0.1~esm1",
            "binary_name": "tomcat11-common"
        },
        {
            "binary_name": "tomcat11-docs",
            "binary_version": "11.0.18-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "tomcat11-examples",
            "binary_version": "11.0.18-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "tomcat11-user",
            "binary_version": "11.0.18-1ubuntu0.1~esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:26.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-41284"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-41293"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-42498"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-43515"
        }
    ]
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8450-1.json"