Quick answers
- Is CVE-2026-15555 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-15555 being exploited in the wild.
- How severe is CVE-2026-15555?
- High severity, with a CVSS score of 8.8, published 11 August 2026.
- Which products and versions are affected?
- Red Hat Infinispan <UNKNOWN>.
- Is there a fix for CVE-2026-15555?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-15555 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-15555?
- Check whether you run Red Hat Infinispan at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is a deserialization vulnerability in the Infinispan session replication path. The JBoss Marshalling River unmarshaller deserializes replicated session data without class filtering, permitting exploitation via gadget chains. An attacker with network access to the Infinispan cluster can craft malicious serialized objects that, when deserialized, execute arbitrary code on cluster nodes. The vulnerability affects the inter-node communication channel and requires no authentication or user interaction. Patches addressing class filtering or alternative serialization mechanisms are expected from Red Hat.
Affected products
- Red Hat Infinispan <UNKNOWN>
Timeline
- 2026-08-11: disclosed