OSV-2025-638 Security exception in com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deser
A security exception in Jackson's untyped object deserializer can cause a denial of service when processing malicious JSON input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2025-638?
OSV-2025-638 is a denial of service vulnerability in json2avro, published on 17 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=438873397
Crash type: Security exception
Crash state:
com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.deser
com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer$Vanilla.mapOb
com.fasterxml.jackson.core.json.UTF8StreamJsonParser.findName
Which versions are affected by OSV-2025-638?
1 open source package ship an affected version, including json2avro.
| Package | Affected | Fixed in |
|---|---|---|
json2avro OSS-Fuzz | All versions | None |
How do I fix OSV-2025-638?
No fix has been published for OSV-2025-638 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-2025-638 being exploited?
There is no known exploitation of OSV-2025-638 in the wild and no public exploit code.