OSV-2026-455 UNKNOWN READ in mkv::matroska_segment_c::TrackInit
A memory corruption vulnerability in the Matroska parsing library allows attackers to cause a denial of service via crafted media files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2026-455?
OSV-2026-455 is a memory corruption vulnerability in vlc, published on 25 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=495498906
Crash type: UNKNOWN READ
Crash state:
mkv::matroska_segment_c::TrackInit
mkv::matroska_segment_c::TrackInit
mkv::matroska_segment_c::ParseTrackEntry
Which versions are affected by OSV-2026-455?
1 open source package ship an affected version, including vlc.
| Package | Affected | Fixed in |
|---|---|---|
vlc OSS-Fuzz | All versions | None |
How do I fix OSV-2026-455?
No fix has been published for OSV-2026-455 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2026-455 being exploited?
There is no known exploitation of OSV-2026-455 in the wild and no public exploit code.