CVE-2019-9718

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Source
https://nvd.nist.gov/vuln/detail/CVE-2019-9718
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-9718.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2019-9718
Downstream
Related
Published
2019-03-12T09:29:00Z
Modified
2025-10-15T11:20:54.204503Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ffhtmlmarkupto_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

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
23ccf3cabb4baf6e8af4b1af3fcc59c904736f21
Type
GIT
Repo
https://git.ffmpeg.org/ffmpeg.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
1f00c97bc3475c477f3c468cf2d924d5761d0982

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
n3.2-dev
n3.2.1
n3.2.10
n3.2.11
n3.2.12
n3.2.13
n3.2.2
n3.2.3
n3.2.4
n3.2.5
n3.2.6
n3.2.7
n3.2.8
n3.2.9
n3.3-dev
n3.4-dev
n3.5-dev

n4.*

n4.1-dev
n4.2-dev

Database specific

vanir_signatures

[
    {
        "signature_type": "Function",
        "id": "CVE-2019-9718-755ab778",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/23ccf3cabb4baf6e8af4b1af3fcc59c904736f21",
        "signature_version": "v1",
        "target": {
            "function": "ff_htmlmarkup_to_ass",
            "file": "libavcodec/htmlsubtitles.c"
        },
        "digest": {
            "function_hash": "134429341697870814247987316111924007456",
            "length": 3632.0
        },
        "deprecated": false
    },
    {
        "signature_type": "Line",
        "id": "CVE-2019-9718-da1a4911",
        "source": "https://github.com/ffmpeg/ffmpeg/commit/23ccf3cabb4baf6e8af4b1af3fcc59c904736f21",
        "signature_version": "v1",
        "target": {
            "file": "libavcodec/htmlsubtitles.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "146229409084369695006291932218330531278",
                "186871920662715219977446106701134555870",
                "310562769026243982809424482522257025845",
                "34344457376983665913898773828430549216",
                "260166848363255873671710857472511837215",
                "80024346695892532889397988976103392180",
                "202968329324838149850240999019982554458"
            ]
        },
        "deprecated": false
    }
]