USN-8004-2 (UBUNTU-CVE-2026-23533)

Vulnerability from osv_ubuntu – Published: 2026-02-08 22:38 – Updated: 2026-09-11 12:08 – Source website
VLAI
Summary
freerdp2 regression
Details

USN-8004-1 fixed vulnerabilities in FreeRDP. The update for CVE-2026-23533 introduced a regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Kim Dong Han discovered that FreeRDP did not correctly validate the size of certain variables, which could cause a buffer overflow. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
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              "severity": [
                {
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                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
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              "id": "CVE-2026-23533",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "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",
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                }
              ]
            }
          ],
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        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
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            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
          {
            "binary_name": "freerdp2-wayland",
            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
          {
            "binary_name": "freerdp2-x11",
            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
          {
            "binary_name": "libfreerdp-client2-2",
            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
          {
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          },
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          },
          {
            "binary_name": "libfreerdp-shadow2-2",
            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
          {
            "binary_name": "libfreerdp2-2",
            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
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            "binary_name": "libuwac0-0",
            "binary_version": "2.6.1+dfsg1-0ubuntu0.20.04.2+esm2"
          },
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            "binary_name": "libwinpr-tools2-2",
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          }
        ]
      },
      "package": {
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        "name": "freerdp2",
        "purl": "pkg:deb/ubuntu/freerdp2@2.6.1+dfsg1-0ubuntu0.20.04.2+esm2?arch=source\u0026distro=esm-infra/focal"
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                  "type": "CVSS_V4"
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                {
                  "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "freerdp2-shadow-x11",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
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            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
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            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
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            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libfreerdp-server2-2",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libfreerdp-shadow-subsystem2-2",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libfreerdp-shadow2-2",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libfreerdp2-2",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libuwac0-0",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libwinpr-tools2-2",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "libwinpr2-2",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          },
          {
            "binary_name": "winpr-utils",
            "binary_version": "2.6.1+dfsg1-3ubuntu2.9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "freerdp2",
        "purl": "pkg:deb/ubuntu/freerdp2@2.6.1+dfsg1-3ubuntu2.9?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
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            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0+dfsg1-2build1",
        "2.3.0+dfsg1-2ubuntu1",
        "2.3.0+dfsg1-2ubuntu2",
        "2.4.1+dfsg1-1",
        "2.4.1+dfsg1-1ubuntu1",
        "2.4.1+dfsg1-1ubuntu2",
        "2.5.0+dfsg1-1",
        "2.6.0+dfsg1-1",
        "2.6.1+dfsg1-1",
        "2.6.1+dfsg1-3",
        "2.6.1+dfsg1-3ubuntu1",
        "2.6.1+dfsg1-3ubuntu2",
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        "2.6.1+dfsg1-3ubuntu2.2",
        "2.6.1+dfsg1-3ubuntu2.3",
        "2.6.1+dfsg1-3ubuntu2.4",
        "2.6.1+dfsg1-3ubuntu2.5",
        "2.6.1+dfsg1-3ubuntu2.6",
        "2.6.1+dfsg1-3ubuntu2.7",
        "2.6.1+dfsg1-3ubuntu2.8"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
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            {
              "id": "CVE-2026-23533",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
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                },
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "freerdp2-shadow-x11",
            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          },
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            "binary_name": "freerdp2-wayland",
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            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          },
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            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          },
          {
            "binary_name": "libfreerdp-shadow2-2t64",
            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          },
          {
            "binary_name": "libfreerdp2-2t64",
            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          },
          {
            "binary_name": "libuwac0-0t64",
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          },
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            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          },
          {
            "binary_name": "libwinpr2-2t64",
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          },
          {
            "binary_name": "winpr-utils",
            "binary_version": "2.11.5+dfsg1-1ubuntu0.1~esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "freerdp2",
        "purl": "pkg:deb/ubuntu/freerdp2@2.11.5+dfsg1-1ubuntu0.1~esm4?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.5+dfsg1-1ubuntu0.1~esm4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.0+dfsg1-1.1ubuntu1",
        "2.11.2+dfsg1-1",
        "2.11.2+dfsg1-1build1",
        "2.11.2+dfsg1-1build3",
        "2.11.5+dfsg1-1build1",
        "2.11.5+dfsg1-1build2",
        "2.11.5+dfsg1-1ubuntu0.1~esm1",
        "2.11.5+dfsg1-1ubuntu0.1~esm2",
        "2.11.5+dfsg1-1ubuntu0.1~esm3"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8004-1 fixed vulnerabilities in FreeRDP. The update for\nCVE-2026-23533 introduced a regression. This update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\nKim Dong Han discovered that FreeRDP did not correctly validate the size of\ncertain variables, which could cause a buffer overflow. An attacker could\npossibly use this issue to cause a denial of service or execute arbitrary\ncode.",
  "id": "USN-8004-2",
  "modified": "2026-09-11T12:08:47Z",
  "published": "2026-02-08T22:38:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8004-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-23533"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.launchpad.net/bugs/2139694"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "freerdp2 regression",
  "upstream": [
    "UBUNTU-CVE-2026-23533"
  ]
}



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