A minor correction to my email: on this report, the parameter in question is 
"code challenge" and not "code_verifier" but the rest of the reply stands. 
Copy-paste error on my part, as both errata reports have the same problem.

- Justin
________________________________
From: Justin Richer <[email protected]>
Sent: Saturday, June 14, 2025 7:18 AM
To: RFC Errata System <[email protected]>
Cc: Jeffrey S Walden <[email protected]>; [email protected] 
<[email protected]>; [email protected] <[email protected]>; [email protected] 
<[email protected]>
Subject: Re: [OAUTH-WG] [Editorial Errata Reported] RFC7636 (8458)

This is not an error and the errata should be rejected. As per the ABNF 
definition in 
https://www.rfc-editor.org/rfc/rfc5234.html#section-21<https://www.rfc-editor.org/rfc/rfc5234.html#section-2.1>
 the name contains "alphabetics, digits, and hyphens (dashes)", and not 
underscores. I believe the commenter is expecting the ABNF rule name of 
code-verifier to match the parameter name of code_verifier, but they do not 
need to be the same. While this is confusing, the text is correct as it stands.

- Justin
________________________________
From: RFC Errata System <[email protected]>
Sent: Friday, June 13, 2025 6:12 AM
To: [email protected] <[email protected]>
Cc: Jeffrey S Walden <[email protected]>; [email protected] 
<[email protected]>; [email protected] <[email protected]>; [email protected] 
<[email protected]>
Subject: [OAUTH-WG] [Editorial Errata Reported] RFC7636 (8458)

The following errata report has been submitted for RFC7636,
"Proof Key for Code Exchange by OAuth Public Clients".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid8458

--------------------------------------
Type: Editorial
Reported by: Jeff Walden <[email protected]>

Section: 4.2

Original Text
-------------
code-challenge = 43*128unreserved

Corrected Text
--------------
code_challenge = 43*128unreserved

Notes
-----
The ABNF accidentally uses a hyphen/dash rather than an underscore in the 
code_challenge name in its rule.

Instructions:
-------------
This erratum is currently posted as "Reported". (If it is spam, it
will be removed shortly by the RFC Production Center.) Please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party
will log in to change the status and edit the report, if necessary.

--------------------------------------
RFC7636 (draft-ietf-oauth-spop-15)
--------------------------------------
Title               : Proof Key for Code Exchange by OAuth Public Clients
Publication Date    : September 2015
Author(s)           : N. Sakimura, Ed., J. Bradley, N. Agarwal
Category            : PROPOSED STANDARD
Source              : Web Authorization Protocol
Stream              : IETF
Verifying Party     : IESG

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