CVE-2026-26955

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Source
https://cve.org/CVERecord?id=CVE-2026-26955
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-26955.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-26955
Aliases
  • GHSA-mr6w-ch7c-mqqj
Downstream
Related
Published
2026-02-25T20:47:14.660Z
Modified
2026-07-16T08:45:28.114638Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
FreeRDP has Out-of-bounds Write
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26955.json",
    "cwe_ids": [
        "CWE-787"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/freerdp/freerdp

Affected ranges

Type
GIT
Repo
https://github.com/freerdp/freerdp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b933ae18d9ad2a1d73c610868fcc30eb61654070
Fixed
7d8fdce2d0ef337cb86cb37fc0c436c905e04d77
Database specific 
{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.23.0"
        }
    ]
}

Affected versions

1.*
1.0-beta1
1.0-beta2
1.0-beta4
1.0-beta5
1.0.0
1.0.1
1.1.0-beta+2013071101
1.1.0-beta1
1.1.0-beta1+android2
1.1.0-beta1+android3
1.1.0-beta1+android4
1.1.0-beta1+android5
1.1.0-beta1+ios1
1.1.0-beta1+ios2
1.1.0-beta1+ios3
1.1.0-beta1+ios4
1.2.0-beta1+android7
1.2.0-beta1+android9
2.*
2.0.0
2.0.0-beta1+android10
2.0.0-beta1+android11
2.0.0-rc0
2.0.0-rc1
2.0.0-rc2
2.0.0-rc3
2.0.0-rc4
3.*
3.0.0
3.0.0-beta1
3.0.0-beta2
3.0.0-beta3
3.0.0-beta4
3.0.0-rc0
3.1.0
3.2.0
3.3.0
3.4.0
3.5.0
3.5.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-26955.json"
vanir_signatures 
[
    {
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "337102543481686678806426411982219186725",
                "142178338594568985456747912589820267684",
                "321241827299255414039213524635076784854",
                "191482064253101754193482270492063537284",
                "313014913062463781557687446026456019312",
                "225939152721285012853400641492428312768",
                "157778159804837661293442588007063628225",
                "249096992896262465669941567909039340523",
                "118305146628341557657848518247870006318",
                "72464142610846638201591829741155265446",
                "266547187582236839130398311058964394112",
                "109286712232311739019943485516455006562",
                "16373416886167172447552647924719246384"
            ]
        },
        "source": "https://github.com/freerdp/freerdp/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77",
        "signature_type": "Line",
        "target": {
            "file": "libfreerdp/codec/clear.c"
        },
        "id": "CVE-2026-26955-3b6c30c0",
        "deprecated": false
    }
]
vanir_signatures_modified 
"2026-07-16T08:45:28Z"