High [CVE-2026-82436] Apache Storm: Description `DefaultStateSerializer`, used to persist and restore stateful bolt checkpoints, configured Kryo with class registration disabled and an instantiation strategy that constructs objects without invoking their constructors, then deserialized whatever bytes the state store returned
This high-severity Apache Software Foundation advisory covers CVE-2026-82436; related products: Apache Storm.
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Summary
`DefaultStateSerializer`, used to persist and restore stateful bolt checkpoints, configured Kryo with class registration disabled and an instantiation strategy that constructs objects without invoking their
constructors, then deserialized whatever bytes the state store returned. A party able to write to the
topology's keyspace in the state store, for example a co-tenant of a shared Redis instance or anyone with network access to it, could therefore place a serialized object graph that executes code inside the worker
JVM when the state is restored.
This requires the Redis-backed state provider, which is not the default. Write access to a state-store key
is a data-plane privilege; code execution in the worker JVM is not, so the two are not equivalent.
Affected product named by the advisory: Apache Storm.
Is CVE-2026-82436 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-82436 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-82436?
Upgrade to a fixed release named by Apache:
- 3.1.0
Confirm against the vendor advisory before you patch.
- Apache Storm Client 3.0.0 before 3.1.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Mitigation Upgrade to 3.1.0, where the state serializer requires registered classes.
- Users who cannot upgrade immediately should restrict network and credential access to the state store to the cluster itself.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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