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CVE-2026-23883 (GCVE-0-2026-23883)

Vulnerability from cvelistv5 – Published: 2026-01-19 17:15 – Updated: 2026-07-15 01:17
VLAI
Title
Heap-use-after-free in update_pointer_new
Summary
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, `xf_Pointer_New` frees `cursorPixels` on failure, then `pointer_free` calls `xf_Pointer_Free` and frees it again, triggering ASan UAF. A malicious server can trigger a client‑side use after free, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-20 15:29 UTC
CWE
Impacted products
Vendor Product Version CPE status
FreeRDP FreeRDP Affected: < 3.21.0
guessed Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10 Unaffected: 2:3.10.3-5.el10_1.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.1
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 2:3.10.3-3.el10_0.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8 Unaffected: 2:2.11.7-2.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 2:2.11.7-1.el9_7.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Unaffected: 2:2.4.1-3.el9_0 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.0
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 2:2.4.1-6.el9_2.2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 2:2.11.2-1.el9_4.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 2:2.11.7-1.el9_6.1 , < * (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.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
Create a notification for this product.
Show details on NVD website

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                "value": "RHSA-2026:2736: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)"
              },
              {
                "lang": "en",
                "value": "RHSA-2026:3037: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)"
              },
              {
                "lang": "en",
                "value": "RHSA-2026:2048: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"
              }
            ],
            "timeline": [
              {
                "lang": "en",
                "time": "2026-01-19T18:01:42.972Z",
                "value": "Reported to Red Hat."
              },
              {
                "lang": "en",
                "time": "2026-01-19T17:15:55.735Z",
                "value": "Made public."
              }
            ],
            "title": "freerdp: FreeRDP: Arbitrary code execution and denial of service via malicious server",
            "x_adpType": "supplier",
            "x_generator": {
              "engine": "sadp-cli 1.0.0"
            }
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-23883",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-20T15:29:59.841389Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-20T15:30:04.532Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "FreeRDP",
              "vendor": "FreeRDP",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 3.21.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, `xf_Pointer_New` frees `cursorPixels` on failure, then `pointer_free` calls `xf_Pointer_Free` and frees it again, triggering ASan UAF. A malicious server can trigger a client\u2011side use after free, causing a crash (DoS) and potential heap corruption with code\u2011execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 7.7,
                "baseSeverity": "HIGH",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "vectorString": "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-416",
                  "description": "CWE-416: Use After Free",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-01-19T17:15:55.735Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qcrr-85qx-4p6x",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qcrr-85qx-4p6x"
            },
            {
              "name": "https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.c#L312-L319",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.c#L312-L319"
            },
            {
              "name": "https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.c#L340",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/client/X11/xf_graphics.c#L340"
            },
            {
              "name": "https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/pointer.c#L164-L174",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/pointer.c#L164-L174"
            },
            {
              "name": "https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0"
            }
          ],
          "source": {
            "advisory": "GHSA-qcrr-85qx-4p6x",
            "discovery": "UNKNOWN"
          },
          "title": "Heap-use-after-free in update_pointer_new"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-23883",
        "datePublished": "2026-01-19T17:15:55.735Z",
        "dateReserved": "2026-01-16T21:02:02.901Z",
        "dateUpdated": "2026-07-15T01:17:52.426Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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