CVE-2026-91948

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Source

https://cve.org/CVERecord?id=CVE-2026-91948

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91948.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-91948

Aliases

GHSA-9jcm-x588-gh26

Downstream

Published

2026-09-15T15:18:06Z

Modified

2026-10-28T11:19:38Z

Severity

7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

FreeRDP before 3.31.0 Out-of-bounds Write via SHOW_PROTOCOL

Details

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

Database specific

{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-191"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91948.json"
}

References

Affected packages

Git / github.com/freerdp/freerdp

Affected ranges

Type

GIT

Repo

https://github.com/freerdp/freerdp

Events

Introduced

5370fb26fbf034ecd11d3026b6ad639b5fff493f

Fixed

aa8650b300aa4cabd85d9c72b431301509b9043f

Fixed

40d9202cd95551600c07437ce6bd5ecd7d31e57b

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "3.28.0"
                },
                {
                    "fixed":  "3.31.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "40d9202cd95551600c07437ce6bd5ecd7d31e57b"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91948.json"

vanir_signatures

[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "198732462005819818076325029395996794504",
            "length":  1167
        },
        "id":  "CVE-2026-91948-53352a1a",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/freerdp/freerdp/commit/40d9202cd95551600c07437ce6bd5ecd7d31e57b",
        "target":  {
            "file":  "libfreerdp/core/server.c",
            "function":  "WTSProcessChannelData"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
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            "threshold":  0.9
        },
        "id":  "CVE-2026-91948-aa2d8789",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/freerdp/freerdp/commit/40d9202cd95551600c07437ce6bd5ecd7d31e57b",
        "target":  {
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]

vanir_signatures_modified

"2026-10-28T11:19:38Z"