OSV-2025-620 Heap-buffer-overflow in FragPrepareChunk
A heap buffer overflow in FragPrepareChunk allows attackers to execute arbitrary code or cause denial of service via crafted media streams.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2025-620?
OSV-2025-620 is a memory corruption vulnerability in vlc, published on 12 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=437694938
Crash type: Heap-buffer-overflow WRITE 8
Crash state:
FragPrepareChunk
DemuxFrag
demux_process_stream
Which versions are affected by OSV-2025-620?
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-2025-620?
No fix has been published for OSV-2025-620 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-2025-620 being exploited?
There is no known exploitation of OSV-2025-620 in the wild and no public exploit code.