CVE-2026-85089 (GCVE-0-2026-85089)

Vulnerability from cvelistv5 – Published: 2026-09-03 01:04 – Updated: 2026-09-03 13:58
VLAI
Title
FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory
Summary
FreeRDP versions 3.0.0 through 3.30.0 (before 3.31.0) transmit uninitialized heap memory in Save Session Info PDU reserved padding fields. Three PDU writers in libfreerdp/core/info.c (rdp_write_logon_info_v2, rdp_write_logon_info_plain, and rdp_write_logon_info_ex) use Stream_Seek instead of Stream_Zero for reserved pad bytes (up to 576 bytes), leaving previously freed heap contents in the outgoing PDU. Because the send buffer is allocated with malloc (not zeroed), stale heap data — which may include cleartext credentials from prior sessions — can be sent to the receiving peer. FreeRDP-based servers using rdpUpdate::SaveSessionInfo and freerdp-proxy (which forwards these PDUs) are affected, allowing disclosure of server/proxy process memory to a downstream client.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 13:58 UTC
CWE
  • CWE-908 - Use of Uninitialized Resource
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6635 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
FreeRDP FreeRDP Affected: 3.0.0 , < 3.31.0 (semver)
Unaffected: 3.31.0 (semver)
    cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-13 00:00
Credits
VladimirEliTokarev
Show details on NVD website
To clipboard 

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              "url": "https://github.com/FreeRDP/FreeRDP/commit/056cede398d71c1f2540baebc26ec3327a249301"
            },
            {
              "name": "Patch Commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/commit/483c9388119f06bac420d92053cff9ef94e83bea"
            },
            {
              "name": "FreeRDP 3.31.0 Release Notes",
              "tags": [
                "release-notes"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/releases/tag/3.31.0"
            },
            {
              "tags": [
                "technical-description"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/blob/3.30.0/libfreerdp/core/info.c#L1541"
            },
            {
              "tags": [
                "product"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP"
            },
            {
              "name": "VulnCheck Advisory: FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory",
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/freerdp-before-3.31.0-information-disclosure-via-uninitialized-heap-memory"
            }
          ],
          "title": "FreeRDP before 3.31.0 Information Disclosure via uninitialized heap memory",
          "x_generator": {
            "engine": "vulncheck-endgame"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-85089",
        "datePublished": "2026-09-03T01:04:43.093Z",
        "dateReserved": "2026-09-02T23:52:57.051Z",
        "dateUpdated": "2026-09-03T13:58:37.769Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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