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CVE-2019-9718

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the...

6.5 MediumFix available

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.57%Down 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
CVE-2019-9718
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-125
Updated
2026-11-02
CVE List No score

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
CVE-2019-9718
Updated
2026-11-02
EUVDEUVD-2019-19083 No score

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
EUVD-2019-19083
Updated
2026-11-03
GitHub AdvisoriesGHSA-423p-f8g4-wmpc 6.5

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the...

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
GHSA-423p-f8g4-wmpc
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-125
Updated
2026-11-02
OSVALPINE-CVE-2019-9718 6.5

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
ALPINE-CVE-2019-9718
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 6.5

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
CVE-2019-9718
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-07
Show 6 moreShow less
OSVDEBIAN-CVE-2019-9718 6.5

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
DEBIAN-CVE-2019-9718
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVJLSEC-2025-102 6.5

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU...

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
JLSEC-2025-102
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Updated
2026-11-02
OSVUBUNTU-CVE-2019-9718 6.5

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 ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Record
UBUNTU-CVE-2019-9718
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVSUSE-SU-2019:3184-1 No score

Security update for ffmpeg

This update for ffmpeg fixes the following issues:

Security issues fixed:

  • CVE-2019-17542: Fixed a heap-buffer overflow in vqa_decode_chunk due to an out-of-array access (bsc#1154064).
  • CVE-2019-12730: Fixed an uninitialized use of variables due to an improper check (bsc#1137526).
  • CVE-2019-9718: Fixed a denial of service in the subtitle decode (bsc#1129715).
  • CVE-2018-13301: Fixed a denial of service while converting a crafted AVI file to MPEG4 (bsc#1100352).
Record
SUSE-SU-2019:3184-1
Updated
2026-11-02
OSVSUSE-SU-2019:3184-2 No score

Security update for ffmpeg

This update for ffmpeg fixes the following issues:

Security issues fixed:

  • CVE-2019-17542: Fixed a heap-buffer overflow in vqa_decode_chunk due to an out-of-array access (bsc#1154064).
  • CVE-2019-12730: Fixed an uninitialized use of variables due to an improper check (bsc#1137526).
  • CVE-2019-9718: Fixed a denial of service in the subtitle decode (bsc#1129715).
  • CVE-2018-13301: Fixed a denial of service while converting a crafted AVI file to MPEG4 (bsc#1100352).
Record
SUSE-SU-2019:3184-2
Updated
2026-11-02
OSVUSN-3967-1 No score

FFmpeg vulnerabilities

It was discovered that FFmpeg contained multiple security issues when handling certain multimedia files. If a user were tricked into opening a crafted multimedia file, an attacker could cause a denial of service via application crash.

Record
USN-3967-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ffmpeg
Alpine:v3.10
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.11
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.12
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.13
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.14
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.15
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.16
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.17
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.18
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.19
 before 4.1.3-r0
4.1.3-r0
Show 27 moreShow less
Affected packages
PackageAffectedFixed
ffmpeg
Alpine:v3.20
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.21
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.22
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.23
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.24
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Alpine:v3.8
 before 3.4.6-r0
3.4.6-r0
ffmpeg
Alpine:v3.9
 before 4.0.4-r0
4.0.4-r0
ffmpeg4
Alpine:v3.16
 before 4.1.3-r0
4.1.3-r0
ffmpeg4
Alpine:v3.17
 before 4.1.3-r0
4.1.3-r0
ffmpeg4
Alpine:v3.18
 before 4.1.3-r0
4.1.3-r0
ffmpeg4
Alpine:v3.19
 before 4.1.3-r0
4.1.3-r0
ffmpeg4
Alpine:v3.20
 before 4.1.3-r0
4.1.3-r0
ffmpeg4
Alpine:v3.21
 before 4.1.3-r0
4.1.3-r0
ffmpeg4
Alpine:v3.22
 before 4.1.3-r0
4.1.3-r0
ffmpeg
Debian:12
 before 7:4.1.3-1
7:4.1.3-1
ffmpeg
Debian:13
 before 7:4.1.3-1
7:4.1.3-1
ffmpeg
Debian:14
 before 7:4.1.3-1
7:4.1.3-1
ffmpeg
Debian:9
From an advisory covering 5 CVEs
 before 7:3.2.14-1~deb9u1, plus listed versions
7:3.2.10-1~deb9u17:3.2.10-1~deb9u1~bpo8+17:3.2.11-1~deb9u17:3.2.12-1~deb9u17:3.2.5-1
Show 4 moreShow less
7:3.2.6-17:3.2.7-1~deb9u17:3.2.8-1~deb9u17:3.2.9-1~deb9u1
7:3.2.14-1~deb9u1
FFMPEG_jll
Julia
 before 4.3.1+0
4.3.1+0
ffmpeg
SUSE:Linux Enterprise Module for Desktop Applications 15
From an advisory covering 4 CVEs
 before 3.4.2-4.27.1
3.4.2-4.27.1
ffmpeg
SUSE:Linux Enterprise Module for Desktop Applications 15 SP1
From an advisory covering 4 CVEs
 before 3.4.2-4.27.1
3.4.2-4.27.1
ffmpeg
SUSE:Linux Enterprise Module for Package Hub 15
From an advisory covering 4 CVEs
 before 3.4.2-4.27.1
3.4.2-4.27.1
ffmpeg
SUSE:Linux Enterprise Workstation Extension 15
From an advisory covering 4 CVEs
 before 3.4.2-4.27.1
3.4.2-4.27.1
ffmpeg
SUSE:Linux Enterprise Workstation Extension 15 SP1
From an advisory covering 4 CVEs
 before 3.4.2-4.27.1
3.4.2-4.27.1
ffmpeg
SUSE:Linux Enterprise Module for Package Hub 15 SP1
From an advisory covering 4 CVEs
 before 3.4.2-4.27.1
3.4.2-4.27.1
ffmpeg
Ubuntu:18.04:LTS
 before 7:3.4.6-0ubuntu0.18.04.1, plus listed versions
7:3.3.4-27:3.3.4-2build37:3.4-2ubuntu27:3.4-47:3.4-4build1
Show 6 moreShow less
7:3.4.1-17:3.4.1-1build17:3.4.2-17:3.4.2-1build17:3.4.2-27:3.4.4-0ubuntu0.18.04.1
7:3.4.6-0ubuntu0.18.04.1
ffmpeg
Ubuntu:18.04:LTS
From an advisory covering 4 CVEs
 before 7:3.4.6-0ubuntu0.18.04.1, plus listed versions
7:3.3.4-27:3.3.4-2build37:3.4-2ubuntu27:3.4-47:3.4-4build1
Show 6 moreShow less
7:3.4.1-17:3.4.1-1build17:3.4.2-17:3.4.2-1build17:3.4.2-27:3.4.4-0ubuntu0.18.04.1
7:3.4.6-0ubuntu0.18.04.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-9718 is a medium vulnerability (CVSS 6.5) in Ffmpeg, published March 12, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.57%, the 75th percentile. Fixed in ffmpeg 4.1.3-r0.

References

Show 21 moreShow less
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