CVE-2026-33977

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Source
https://cve.org/CVERecord?id=CVE-2026-33977
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33977.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-33977
Aliases
  • GHSA-8f2g-3q27-6xm5
Downstream
Related
Published
2026-03-30T21:41:36.853Z
Modified
2026-07-15T00:14:23.377108Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)
Details

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (>= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2.

Database specific 
{
    "cwe_ids": [
        "CWE-617"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33977.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "3.24.2"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}
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
9be3f03d94a50892fd58a9f7dee72b2313c69b47
Database specific 
{
    "source": "REFERENCES"
}

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

vanir_signatures 
[
    {
        "signature_type": "Line",
        "id": "CVE-2026-33977-1f80f933",
        "deprecated": false,
        "source": "https://github.com/freerdp/freerdp/commit/9be3f03d94a50892fd58a9f7dee72b2313c69b47",
        "target": {
            "file": "libfreerdp/codec/dsp.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "313059719051168953279981321621284631172",
                "1608208887809092689858395632213707287",
                "266691875119607533276273676915890765709",
                "58203710151291557414018479213843120754",
                "205705319832954602913746864351500691293",
                "167373129491020828174094741663516011435",
                "81115201060302679625618861278598527278",
                "213465713407387026022579136565158143067",
                "300802015265203590247439580603835968284",
                "90375194995024105971758591989173538760",
                "134198277461091868160743266217724947589",
                "11226862666982207573501972149902201389",
                "177772214160195408621174319205105493316",
                "331415897967591359797777520630678136778",
                "190551798074234161013278261547298941486",
                "124309392823400985434997162403683313739",
                "291069044997322580593112420370347525043",
                "47800664452044214651402955194286039763",
                "322490403405468343914317455954834869766",
                "95433370875425295832012757529772309913",
                "173740166329223149998206452018511193413",
                "81115201060302679625618861278598527278",
                "223645821899158928400802442633796775230",
                "260804351523069384712465389180794192958",
                "240452525504598402049089717207176161450"
            ]
        },
        "signature_version": "v1"
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33977.json"
vanir_signatures_modified 
"2026-07-15T00:14:23Z"