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We are unable to verify this erratum that the submitter marked as editorial.  
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RFC Editor/cs


> On Jan 21, 2022, at 5:14 AM, RFC Errata System <[email protected]> 
> wrote:
> 
> The following errata report has been submitted for RFC8446,
> "The Transport Layer Security (TLS) Protocol Version 1.3".
> 
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid6820
> 
> --------------------------------------
> Type: Editorial
> Reported by: Leander Schwarz <[email protected]>
> 
> 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:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party  
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC8446 (draft-ietf-tls-tls13-28)
> --------------------------------------
> 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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