Status:

Verified

Type:

Technical

Reported By:

Ned Freed

Date Reported:

2009-10-13

Verified by:

Alexey Melnikov

Date Verified:

2018-09-21

Section 2.3 says:

mime-charset-chars = ALPHA / DIGIT /
            "!" / "#" / "$" / "%" / "&" /
            "'" / "+" / "-" / "^" / "_" /
            "`" / "{" / "}" / "~"
    

It should say:

mime-charset-chars = ALPHA / DIGIT /
            "!" / "#" / "$" / "%" / "&" /
            "+" / "-" / "^" / "_" / "`" /
            "{" / "}" / "~"

Notes:

RFC 2231 uses single quotes as delimiters around charset names. As such, single quote should have been excluded from the list of legal characters that can appear in a charset name.

Note that this Erratum was further updated by <https://www.rfc-editor.org/errata/eid5433>
to make the list of characters even more restrictive.