rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2

{
  "id": "efda71236460486733da1b6ade0587207480d157cd356e51808f93990c338f84",
  "url": "https://osv.dev/vulnerability/CVE-2026-112279",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2",
    "summary": "rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_bmpcache2() in orders.c that allows malicious RDP servers to crash clients via crafted revision-2 bitmap cache orders. Attackers can send an uncompressed order with large width/height or an underflowing mode nibble and short payload, causing memcpy() reads past the receive buffer and denial of service.",
    "evidence": "osv:CVE-2026-112279",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-112279",
      "aliases": [
        "CVE-2026-112279"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rdesktop/rdesktop",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "50f607ee610bf34e03540e6c04c5b102a49b2ed5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.9.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.9.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.0-beta",
            "v1.9.0",
            "v1.8.3",
            "v1.8.2",
            "v1.8.1",
            "v1.8.0",
            "v1.7.1",
            "v1.7.0",
            "v1.6.0",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0",
            "v1.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112279.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.217603409Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112279.json",
        "https://hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112279",
        "https://www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via-process-bmpcache2",
        "https://github.com/rdesktop/rdesktop/issues/436",
        "https://github.com/rdesktop/rdesktop/pull/437",
        "https://github.com/rdesktop/rdesktop",
        "https://github.com/rdesktop/rdesktop/blob/v1.9.0/orders.c"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112279.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-112279",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489751,
  "published_at": "2026-10-19T13:55:24.937+00:00"
}