CVE catalog

CVE-2026-91948

FreeRDP versions before 3.31.0 contain an…

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

Severity: High · CVSS 7.7CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Aug 26, 2026, 10:00:00 PM UTC
Updated: Sep 15, 2026, 4:17:48 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.59% · Oct 27, 2026

Projects and upstream resources

[freerdp3][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "freerdp2",
      "status": "not affected",
      "release": "bookworm",
      "version": "2.11.7+dfsg1-6~deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "freerdp2",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": [
    {
      "name": "freerdp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1",
        "1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.2",
        "1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.3",
        "1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.4"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-91948"
    },
    {
      "name": "freerdp2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "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",
        "2.11.5+dfsg1-1ubuntu0.1~esm4",
        "2.11.5+dfsg1-1ubuntu0.1~esm5",
        "2.11.5+dfsg1-1ubuntu0.1~esm6"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-91948"
    },
    {
      "name": "freerdp",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1",
        "1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.1",
        "1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-91948"
    },
    {
      "name": "freerdp2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "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",
        "2.6.1+dfsg1-3ubuntu2.1",
        "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",
        "2.6.1+dfsg1-3ubuntu2.9",
        "2.6.1+dfsg1-3ubuntu2.10",
        "2.6.1+dfsg1-3ubuntu2.11"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-91948"
    },
    {
      "name": "freerdp3",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.31.0+dfsg-0ubuntu0.24.04.1"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "3.4.0+dfsg1-0ubuntu2",
        "3.4.0+dfsg1-0ubuntu3",
        "3.4.0+dfsg1-0ubuntu4",
        "3.5.0+dfsg1-0ubuntu1",
        "3.5.1+dfsg1-0ubuntu1",
        "3.5.1+dfsg1-0ubuntu1.1",
        "3.5.1+dfsg1-0ubuntu1.2",
        "3.5.1+dfsg1-0ubuntu1.4",
        "3.5.1+dfsg1-0ubuntu1.5",
        "3.5.1+dfsg1-0ubuntu1.6",
        "3.30.0+dfsg-0ubuntu0.24.04.1",
        "3.30.0+dfsg-0ubuntu0.24.04.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.31.0+dfsg-0ubuntu0.24.04.1",
      "provider_record_id": "UBUNTU-CVE-2026-91948"
    },
    {
      "name": "freerdp3",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.31.0+dfsg-0ubuntu0.26.04.1"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "3.16.0+dfsg-2",
        "3.18.0+dfsg-1ubuntu1",
        "3.19.0+dfsg-1",
        "3.19.1+dfsg-1",
        "3.20.0+dfsg-1",
        "3.20.2+dfsg-1",
        "3.21.0+dfsg-1",
        "3.22.0+dfsg-1",
        "3.24.1+dfsg-1ubuntu1",
        "3.24.2+dfsg-1ubuntu1",
        "3.24.2+dfsg-1ubuntu1.1",
        "3.30.0+dfsg-0ubuntu0.26.04.1",
        "3.30.0+dfsg-0ubuntu0.26.04.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.31.0+dfsg-0ubuntu0.26.04.1",
      "provider_record_id": "UBUNTU-CVE-2026-91948"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[freerdp2-dev]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[freerdp2-shadow-x11]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[freerdp2-wayland]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[freerdp2-x11]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libfreerdp2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libfreerdp-client2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libfreerdp-server2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libfreerdp-shadow2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libfreerdp-shadow-subsystem2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libuwac0-0]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libuwac0-dev]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libwinpr2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libwinpr2-dev]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[libwinpr-tools2-2]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
[winpr-utils]Unknown
Source package: [freerdp2]
Details (2)
- 2.11.7+dfsg1-6~deb12u1 · amd64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm
- 2.11.7+dfsg1-6~deb12u1 · arm64 · bookworm
  Not affected
  nvd · freerdp2 · debian · bookworm

Observed: Oct 23, 2026, 9:35:06 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]