CVE-2026-89318 JweRsaKeyEncryptionDecryptorImpl.Decrypt panics on attacker-chosen IV length (stdlib GCM.Open reached without nonce-size check)

JweRsaKeyEncryptionDecryptorImpl.Decrypt passed the JWE's initialization vector to cipher.AEAD.Open without checking its length. The Go standard library panics rather than returning an error when a GCM nonce is not exactly NonceSize bytes, so a JWE carrying a wrong-sized IV crashes the decrypting...