CVE-2026-18393

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Source
https://cve.org/CVERecord?id=CVE-2026-18393
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-18393.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-18393
Downstream
Published
2026-08-28T09:05:35Z
Modified
2026-08-30T08:06:12Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H CVSS Calculator
Summary
Ffmpeg: ffmpeg: heap buffer overflow in tdsc_load_cursor() via cur_fmt_mono cursor
Details

A flaw was found in FFmpeg. The tdsc_load_cursor() function writes beyond the bounds of a heap-allocated buffer when processing crafted TDSC cursor data. A remote attacker could exploit this by supplying a specially crafted video file, potentially leading to a denial of service or arbitrary code execution.

Database specific 
{
    "cna_assigner": "redhat",
    "cwe_ids": [
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18393.json"
}
References

Affected packages

Git / github.com/ffmpeg/ffmpeg

Affected ranges

Type
GIT
Repo
https://github.com/ffmpeg/ffmpeg
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
242ff799c75f20bade946314c8d741d0887ee11c
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

Other
N
n0.*
n0.11-dev
n0.12-dev
n0.8
n1.*
n1.1-dev
n1.2-dev
n1.3-dev
n2.*
n2.0
n2.1-dev
n2.2-dev
n2.3-dev
n2.4-dev
n2.5-dev
n2.6-dev
n2.7-dev
n2.8-dev
n2.9-dev
n3.*
n3.1-dev
n3.2-dev
n3.3-dev
n3.4-dev
n3.5-dev
n4.*
n4.1-dev
n4.2-dev
n4.3-dev
n4.4-dev
n4.5-dev
n5.*
n5.1-dev
n5.2-dev
n6.*
n6.1-dev
n6.2-dev
n7.*
n7.1-dev
n7.2-dev
n8.*
n8.1-dev
n8.2-dev

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-18393.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "132926603633619437789564998802531084012",
                "5115286422503886191163899541961563008",
                "96726760300170213713591501441628314041",
                "91104098611128400657983985119675472894",
                "132926603633619437789564998802531084012",
                "5115286422503886191163899541961563008",
                "55813710358584922178425752992249684987",
                "331985906405930370156508052252427014409"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-18393-e2aa7986",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/242ff799c75f20bade946314c8d741d0887ee11c",
        "target": {
            "file": "libavcodec/tdsc.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "149856160101408485285483853934977017196",
            "length": 3332
        },
        "id": "CVE-2026-18393-f96efe34",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/242ff799c75f20bade946314c8d741d0887ee11c",
        "target": {
            "file": "libavcodec/tdsc.c",
            "function": "tdsc_load_cursor"
        }
    }
]
vanir_signatures_modified 
"2026-08-30T08:06:12Z"