CVE-2026-19826 alldatacenter alldata xxl-rpc Listener HessianSerializer.java Hessian2Input.readObject deserialization
Remote attackers can execute arbitrary code via unsafe Hessian deserialization in the alldata xxl-rpc Listener component.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19826?
CVE-2026-19826 is a medium-severity unsafe deserialization vulnerability in alldatacenter alldata, published on 14 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was detected in alldatacenter alldata up to 0.6.8. This affects the function Hessian2Input.readObject of the file /serialize/impl/HessianSerializer.java of the component xxl-rpc Listener. The manipulation results in deserialization. The attack may be performed from remote. The exploit is now public and may be used. The project closed the issue report as "not planned" without any further explanation.
Which versions are affected by CVE-2026-19826?
How do I fix CVE-2026-19826?
No fix has been published for CVE-2026-19826 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-19826 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19826 exists.
Sources
Also known as GHSA-fq8p-5fjc-mw7x.