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CVE-2026-43867 is a deserialization of untrusted data flaw in the Apache Camel camel-pqc component. The vulnerable code path is AwsSecretsManagerKeyLifecycleManager.deserializeMetadata(), which reads persisted post-quantum key metadata from a configured AWS Secrets Manager secret, Base64-decodes the stored value, and deserializes it using java.io.ObjectInputStream.readObject() without an ObjectInputFilter or class allow-list. The returned object is only cast to KeyMetadata after readObject() completes, so attacker-controlled readObject() side effects can execute before the type check. A principal able to write to the AWS Secrets Manager secret holding this metadata can store a crafted serialized object that will be deserialized during normal key lifecycle operations. The issue affects Apache Camel camel-pqc versions 4.18.0 before 4.18.3 and 4.19.0 before 4.21.0.
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