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RFC 8446, "The Transport Layer Security (TLS) Protocol Version 1.3", August 2018

Source of RFC: tls (sec)

Errata ID: 8423
Status: Reported
Type: Technical
Publication Format(s) : TEXT

Reported By: Nizar Nadif
Date Reported: 2025-05-19

Section 4.1.2 says:

 struct {
      	ProtocolVersion legacy_version = 0x0303;	/* TLS v1.2 */
      	Random random;
      	opaque legacy_session_id<0..32>;
      	CipherSuite cipher_suites<2..2^16-2>;
      	opaque legacy_compression_methods<1..2^8-1>;
      	Extension extensions<8..2^16-1>;
 } ClientHello;

It should say:

struct {
      	ProtocolVersion legacy_version = 0x0303;	/* TLS v1.2 */
      	Random random;
      	opaque legacy_session_id<0..32>;
      	CipherSuite cipher_suites<2..2^16-2>;
      	opaque legacy_compression_methods<1..2^8-1>;
      	Extension extensions<7..2^16-1>;
} ClientHello;

Notes:

The minimum size of the ClientHello’s extensions is 7 as the bytes of the SupportedVersions field are at least:
- 2 bytes for the type of extension;
- 2 bytes for the length of the extension;
- 1 byte for the length of the following versions;
- 2 bytes per version (and there is at least 1 version).

The typo is also present in the section B.3.1.

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