CVE-2026-33952

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Source
https://cve.org/CVERecord?id=CVE-2026-33952
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33952.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33952
Aliases
  • GHSA-4v4p-9v5x-hc93
Downstream
Related
Published
2026-03-30T21:42:00.473Z
Modified
2026-08-12T15:33:31.762126Z
Severity
  • 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks
Details

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, an unvalidated authlength field read from the network triggers a WINPRASSERT() failure in rtsreadauthverifiernochecks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITHVERBOSEWINPRASSERT=ON). This issue has been patched in version 3.24.2.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "3.24.2"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-617"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33952.json"
}
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
4ac0b6467d371a1ad47c1f751c5b305e4c068adb
Database specific
Show details 
{
    "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

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33952.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "id": "CVE-2026-33952-79be3e73",
        "source": "https://github.com/freerdp/freerdp/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb",
        "signature_type": "Function",
        "digest": {
            "length": 1180.0,
            "function_hash": "59804165366292898073712220204439900962"
        },
        "signature_version": "v1",
        "target": {
            "file": "libfreerdp/core/gateway/rts.c",
            "function": "rts_read_common_pdu_header"
        }
    },
    {
        "deprecated": false,
        "id": "CVE-2026-33952-e5bbbc13",
        "source": "https://github.com/freerdp/freerdp/commit/4ac0b6467d371a1ad47c1f751c5b305e4c068adb",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "231781365805317644818485254324437838217",
                "82578642349437193098999506985254534394",
                "66587847882168671760024679617306138172",
                "331941691904885503869454691564974165656"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "target": {
            "file": "libfreerdp/core/gateway/rts.c"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T15:33:31Z"