CVE-2026-26955 (GCVE-0-2026-26955)

Vulnerability from cvelistv5 – Published: 2026-02-25 20:47 – Updated: 2026-07-15 01:14
VLAI
Title
FreeRDP has Out-of-bounds Write
Summary
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd->left`/`cmd->top` (and subcodec rectangle offsets) to reach image copy routines that write into `surface->data` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct's `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command — full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-26 20:30 UTC
CWE
  • CWE-787 - Out-of-bounds Write
  • CWE-805 - Buffer Access with Incorrect Length Value
Assigner
GitHub_M CNA
References
URL Tags
https://github.com/FreeRDP/FreeRDP/security/advis… x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/7d8fdce… x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-26955 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2443132 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:7292 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5936 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5939 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19033 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6005 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6712 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6616 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6665 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6764 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6395 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6396 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6384 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6385 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6004 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
FreeRDP FreeRDP Affected: < 3.23.0
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 2:3.10.3-12.el10_2.2 , < * (rpm)
Unaffected: 2:3.10.3-5.el10_1.3 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 2:3.10.3-3.el10_0.3 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support Unaffected: 0:2.1.1-5.el7_9.5 , < * (rpm)
    cpe:/o:redhat:rhel_els:7
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 2:2.11.7-4.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support Unaffected: 2:2.0.0-46.rc4.el8_2.8 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.2
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 2:2.2.0-10.el8_4 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 2:2.2.0-10.el8_4 , < * (rpm)
    cpe:/a:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 2:2.2.0-7.el8_6.3 , < * (rpm)
    cpe:/a:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service Unaffected: 2:2.2.0-7.el8_6.3 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions Unaffected: 2:2.2.0-7.el8_6.3 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 2:2.2.0-12.el8_8.3 , < * (rpm)
    cpe:/a:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 2:2.2.0-12.el8_8.3 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 2:2.11.7-1.el9_7.3 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 2:2.4.1-3.el9_0.2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.0
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 2:2.4.1-6.el9_2.4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 2:2.11.2-1.el9_4.3 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 2:2.11.7-1.el9_6.5 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
Show details on NVD website

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            "value": "RHSA-2026:19033: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"
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            "value": "RHSA-2026:6005: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8)"
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            "value": "RHSA-2026:6712: Red Hat Enterprise Linux AppStream AUS (v. 8.2)"
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              {
                "lang": "en",
                "value": "RHSA-2026:6396: Red Hat Enterprise Linux AppStream E4S (v.9.2)"
              },
              {
                "lang": "en",
                "value": "RHSA-2026:6384: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)"
              },
              {
                "lang": "en",
                "value": "RHSA-2026:6385: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)"
              },
              {
                "lang": "en",
                "value": "RHSA-2026:6004: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"
              }
            ],
            "timeline": [
              {
                "lang": "en",
                "time": "2026-02-26T21:03:46.682Z",
                "value": "Reported to Red Hat."
              },
              {
                "lang": "en",
                "time": "2026-02-25T20:47:14.660Z",
                "value": "Made public."
              }
            ],
            "title": "freerdp: FreeRDP: Arbitrary code execution via heap buffer overflow in GDI surface pipeline",
            "workarounds": [
              {
                "lang": "en",
                "value": "To mitigate this issue, avoid connecting to untrusted or unverified RDP servers. Users should only establish RDP connections with known and trusted servers. If connecting to untrusted servers is unavoidable, consider using a sandbox environment or a dedicated, isolated system for such connections to limit potential impact."
              }
            ],
            "x_adpType": "supplier",
            "x_generator": {
              "engine": "sadp-cli 1.0.0"
            }
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-26955",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-02-26T20:30:12.659110Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-02-26T20:30:41.412Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "FreeRDP",
              "vendor": "FreeRDP",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 3.23.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd-\u003eleft`/`cmd-\u003etop` (and subcodec rectangle offsets) to reach image copy routines that write into `surface-\u003edata` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct\u0027s `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command \u2014 full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-787",
                  "description": "CWE-787: Out-of-bounds Write",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-02-25T20:47:14.660Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mr6w-ch7c-mqqj",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mr6w-ch7c-mqqj"
            },
            {
              "name": "https://github.com/FreeRDP/FreeRDP/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77"
            }
          ],
          "source": {
            "advisory": "GHSA-mr6w-ch7c-mqqj",
            "discovery": "UNKNOWN"
          },
          "title": "FreeRDP has Out-of-bounds Write"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-26955",
        "datePublished": "2026-02-25T20:47:14.660Z",
        "dateReserved": "2026-02-16T22:20:28.611Z",
        "dateUpdated": "2026-07-15T01:14:49.142Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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