CVE-2022-25845 is a high-severity (CVSS 8.1) Deserialization of Untrusted Data vulnerability in com.alibaba:fastjson. 6 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for com.alibaba:fastjson — see the affected versions and patch details below.
Deserialization of Untrusted Data
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
com.alibaba:fastjsonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
The package com.alibaba:fastjson before 1.2.83 are vulnerable to Deserialization of Untrusted Data by bypassing the default autoType shutdown restrictions, which is possible under certain conditions. Exploiting this vulnerability allows attacking remote servers. Workaround: If upgrading is not possible, you can enable safeMode.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | com.alibaba:fastjson | ≥ 1.2.25&&< 1.2.83 | 1.2.83com.alibaba:fastjson:1.2.83 |
Affected Products
fastjsonalibabacommunications cloud native core unified data repositoryoracleResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.alibaba:fastjson, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.alibaba:fastjson to 1.2.83 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-25845 is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Users who can not upgrade to the fixed version may enable safeMode; this completely disables the autoType function and eliminates the vulnerability risk. [https://github.com/alibaba/fastjson/wiki/fastjson_safemode]Source: Red Hat security advisory for CVE-2022-25845 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Fuse 7.11 | fastjson | RHSA-2022:5532 |
Frequently Asked Questions
Is CVE-2022-25845 in your dependencies?
Find it across Maven, including transitive dependencies.