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-rw-r--r--activesupport/lib/active_support/message_encryptor.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb
index 24053b4fe5..726e1464ad 100644
--- a/activesupport/lib/active_support/message_encryptor.rb
+++ b/activesupport/lib/active_support/message_encryptor.rb
@@ -115,7 +115,7 @@ module ActiveSupport
# Currently the OpenSSL bindings do not raise an error if auth_tag is
# truncated, which would allow an attacker to easily forge it. See
# https://github.com/ruby/openssl/issues/63
- raise InvalidMessage if aead_mode? && auth_tag.bytes.length != 16
+ raise InvalidMessage if aead_mode? && (auth_tag.nil? || auth_tag.bytes.length != 16)
cipher.decrypt
cipher.key = @secret