The following errata report has been submitted for RFC8446,
"The Transport Layer Security (TLS) Protocol Version 1.3".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid6820

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Type: Editorial
Reported by: Leander Schwarz <lschw...@mozilla.com>

Section: 6.2

Original Text
-------------
unsupported_extension:  Sent by endpoints receiving any handshake
      message containing an extension known to be prohibited for
      inclusion in the given handshake message, or including any
      extensions in a ServerHello or Certificate not first offered in
      the corresponding ClientHello or CertificateRequest. 

Corrected Text
--------------
unsupported_extension:  Sent by endpoints receiving any handshake
      message containing an extension in a ServerHello or Certificate
      not first offered in the corresponding ClientHello or 
      CertificateRequest.

Notes
-----
The definition of the unsupported_extension alert in section 6.2 contradicts 
the statements in section 4.2:

        If an implementation receives an extension
        which it recognizes and which is not specified for the message in
        which it appears, it MUST abort the handshake with an
   "illegal_parameter" alert.

While this might not be inconsistent due to the "abort the handshake with an X 
alert" specification at the beginning of section 6.2, it might lead to 
confusion. (see 
https://mailarchive.ietf.org/arch/msg/tls/hGOGWZRMg718mWqOZ06LwjV9360/).

Instructions:
-------------
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RFC8446 (draft-ietf-tls-tls13-28)
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Title               : The Transport Layer Security (TLS) Protocol Version 1.3
Publication Date    : August 2018
Author(s)           : E. Rescorla
Category            : PROPOSED STANDARD
Source              : Transport Layer Security
Area                : Security
Stream              : IETF
Verifying Party     : IESG

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