USN-8003-1

It was discovered that the RMI component of CRaC JDK 21 would establish RMI TCP endpoint connections to a remote host without setting an endpoint identification algorithm. An unauthenticated remote attacker could possibly use this issue to steal sensitive information. (CVE-2026-21925)

Mingijung discovered that the AWT and JavaFX componenets of CRaC JDK 21 could run programs if Desktop.browse() was supplied a filename as a URI. An unauthenticated remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-21932)

Zhihui Chen discovered that the Networking component of CRaC JDK 21 was suceptible to a CRLF injection vulnerability via the HttpServer class. An unauthenticated remote attacker could possibly use this issue to modify files or leak sensitive information. (CVE-2026-21933)

Ireneusz Pastusiak discovered that the Security component of CRaC JDK 21 failed to verify provided URIs point to a legitimate source when AIA is enabled. An unauthenticated remote attacker could possibly use this issue to redirect users to malicious hosts. (CVE-2026-21945)

In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes.

Please see the following for more information: https://openjdk.org/groups/vulnerability/advisories/2026-01-20

References

Affected packages

Ubuntu:25.10 / openjdk-21-crac

Package

Name: openjdk-21-crac
Purl: pkg:deb/ubuntu/openjdk-21-crac@21.0.10+7-0ubuntu1~25.10?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

21.0.10+7-0ubuntu1~25.10

Affected versions

21.*

21.0.6+7-0ubuntu1

21.0.7+6.1-0ubuntu1

21.0.8+9-0ubuntu1

21.0.9+10-0ubuntu1~25.10

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "openjdk-21-crac-demo",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-jdk",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-jdk-headless",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-jre",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-jre-headless",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-jre-zero",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-source",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        },
        {
            "binary_name": "openjdk-21-crac-testsupport",
            "binary_version": "21.0.10+7-0ubuntu1~25.10"
        }
    ]
}

Database specific

cves_map

{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-21925"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-21932"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-21933"
        },
        {
            "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-2026-21945"
        }
    ],
    "ecosystem": "Ubuntu:25.10"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8003-1.json"