{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"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.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26955" }, { "summary":"CVE-2026-26955 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-26955.json" }, { "summary":"openEuler-SA-2026-2040", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2040" }, { "summary":"CVE-2026-26955", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-26955&packageName=freerdp" } ], "title":"openEuler cve CVE-2026-26955", "tracking":{ "initial_release_date":"2026-04-28T10:54:47+08:00", "revision_history":[ { "date":"2026-04-28T10:54:47+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-04-28T10:54:47+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-04-28T10:54:47+08:00", "id":"CVE-2026-26955", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP1" }, "product_id":"openEuler-24.03-LTS-SP1", "name":"openEuler-24.03-LTS-SP1" }, "name":"openEuler-24.03-LTS-SP1", "category":"product_version" } ], "category":"product_name" }, { "name":"src", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP1" }, "product_id":"freerdp-2.11.8-3.oe2403sp1.src.rpm", "name":"freerdp-2.11.8-3.oe2403sp1.src.rpm" }, "name":"freerdp-2.11.8-3.oe2403sp1.src.rpm", "category":"product_version" } ], "category":"architecture" }, { "name":"x86_64", "branches":[ { "product":{ "product_identification_helper":{ 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"category":"default_component_of" } ] }, "vulnerabilities":[ { "cve":"CVE-2026-26955", "notes":[ { "text":"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.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS-SP1:freerdp-2.11.8-3.oe2403sp1.src", "openEuler-24.03-LTS-SP1:freerdp-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:freerdp-debuginfo-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:freerdp-debugsource-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:freerdp-devel-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:freerdp-help-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:libwinpr-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:libwinpr-devel-2.11.8-3.oe2403sp1.x86_64", "openEuler-24.03-LTS-SP1:freerdp-2.11.8-3.oe2403sp1.aarch64", "openEuler-24.03-LTS-SP1:freerdp-debuginfo-2.11.8-3.oe2403sp1.aarch64", "openEuler-24.03-LTS-SP1:freerdp-debugsource-2.11.8-3.oe2403sp1.aarch64", "openEuler-24.03-LTS-SP1:freerdp-devel-2.11.8-3.oe2403sp1.aarch64", "openEuler-24.03-LTS-SP1:freerdp-help-2.11.8-3.oe2403sp1.aarch64", "openEuler-24.03-LTS-SP1:libwinpr-2.11.8-3.oe2403sp1.aarch64", "openEuler-24.03-LTS-SP1:libwinpr-devel-2.11.8-3.oe2403sp1.aarch64" ] }, "remediations":[ { "product_ids":{ "$ref":"$.vulnerabilities[0].product_status.fixed" }, "details":"freerdp security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2040" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"HIGH", "baseScore":8.8, "vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version":"3.1" }, "products":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-26955" } ] }