OSV-2025-547 Security exception in com.alibaba.fastjson2.JSONReader.readArray
A security exception in fastjson2's JSONReader can cause a denial of service when processing crafted JSON input.
- 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-2025-547?
OSV-2025-547 is a denial of service vulnerability in fastjson2, published on 15 Jul 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=431584944
Crash type: Security exception
Crash state:
com.alibaba.fastjson2.JSONReader.readArray
java.base/java.nio.charset.CharsetEncoder.<init>
java.base/java.nio.charset.CharsetEncoder.<init>
Which versions are affected by OSV-2025-547?
1 open source package ship an affected version, including fastjson2.
| Package | Affected | Fixed in |
|---|---|---|
fastjson2 OSS-Fuzz | All versions | None |
How do I fix OSV-2025-547?
No fix has been published for OSV-2025-547 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is OSV-2025-547 being exploited?
There is no known exploitation of OSV-2025-547 in the wild and no public exploit code.