OSV-2025-835 Heap-use-after-free in JS_DefineProperty
A heap-use-after-free in JS_DefineProperty allows attackers to execute arbitrary code or cause denial of service via crafted JavaScript.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2025-835?
OSV-2025-835 is an use after free vulnerability in quickjs, published on 14 Oct 2025. An attacker can exploit it over the internet without logging in, 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=451334094
Crash type: Heap-use-after-free READ 8
Crash state:
JS_DefineProperty
build_backtrace
JS_CallInternal
Which versions are affected by OSV-2025-835?
1 open source package ship an affected version, including quickjs.
| Package | Affected | Fixed in |
|---|---|---|
quickjs OSS-Fuzz | All versions | None |
How do I fix OSV-2025-835?
No fix has been published for OSV-2025-835 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is OSV-2025-835 being exploited?
There is no known exploitation of OSV-2025-835 in the wild and no public exploit code.