A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf
Published Sep 19, 2019
8.8
HIGHCVSS 3.1
EPSS 2.02%
Description
A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf. NOTE: Third parties dispute that this is a vulnerability because “no evidence of a vulnerability is provided” and only “a generic warning from a static code analysis” is provided
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.02% (0.02025) | 80.28th | v5 (v2026.06.15) |
| Sep 20, 2026 | 2.02% (0.02025) | 80.13th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.56% (0.00555) | 77.80th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.56% (0.00555) | 76.89th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.56% (0.00555) | 74.71th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.32% (0.00320) | 65.84th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.19% (0.09187) | 87.06th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.50% (0.04504) | 76.47th | v1 |
| Jan 6, 2022 | 4.50% (0.04504) | 76.26th | v1 |
| Jan 5, 2022 | 1.04% (0.01040) | 65.70th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01040) | 0.00th | v1 |
References (4)
- https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L113 x_refsource_MISCExploitThird Party Advisory
- https://github.com/libav/libav/commits/master/libavcodec/srtdec.c x_refsource_MISCThird Party Advisory
- https://lgtm.com/projects/g/libav/libav/snapshot/f5f553ca3bdca0c97dd08bbf002f0d8cb193788b/files/libavcodec/srtdec.c?sort=name&dir=ASC&mode=heatmap#xeec693aa6d85853b:1 x_refsource_MISCExploitThird Party Advisory
- https://lgtm.com/security/ x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L113 | x_refsource_MISCExploitThird Party Advisory | |
| https://github.com/libav/libav/commits/master/libavcodec/srtdec.c | x_refsource_MISCThird Party Advisory | |
| https://lgtm.com/projects/g/libav/libav/snapshot/f5f553ca3bdca0c97dd08bbf002f0d8cb193788b/files/libavcodec/srtdec.c?sort=name&dir=ASC&mode=heatmap#xeec693aa6d85853b:1 | x_refsource_MISCExploitThird Party Advisory | |
| https://lgtm.com/security/ | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.