Description
In Libav 12.3, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c has a complex format argument to sscanf.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | gst-libav1.0 +1 | No fix yet | — |
| Ubuntu 26.04 LTS | gst-libav1.0 | No fix yet | — |
| Ubuntu 25.10 | gst-libav1.0 +1 | No fix yet | — |
| Ubuntu 24.04 LTS | gst-libav1.0 | No fix yet | — |
| Ubuntu 22.04 LTS | gst-libav1.0 | No fix yet | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | gst-libav1.0 | No fix yet | — |
| Ubuntu 18.04 LTS | gst-libav1.0 | No fix yet | — |
| Ubuntu 16.04 LTS | gst-libav1.0 | No fix yet | — |
| Ubuntu Pro 26.04 LTS | qtwebengine-opensource-src | No fix yet | — |
| Ubuntu Pro 24.04 LTS | qtwebengine-opensource-src | No fix yet | — |
| Ubuntu Pro 22.04 LTS | qtwebengine-opensource-src | No fix yet | — |
| Ubuntu Pro 20.04 LTS | qtwebengine-opensource-src | No fix yet | — |
| Ubuntu Pro 18.04 LTS | qtwebengine-opensource-src | No fix yet | — |