A security vulnerability in the Java Runtime Environment with verifying HMAC digests may allow authentication to be bypassed. This could allow a user to forge a digital signature that would be accepted as valid. Applications that validate HMAC-based digital signatures may be vulnerable to this type of attack.

Note: This vulnerability cannot be exploited by an untrusted applet or Java Web Start application.

Sun acknowledges, with thanks, Coda Hale for bringing this issue to our attention.

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