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SECONDARY-CERTS: Add a section addressing trust-store divergence - #3585

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egorbaty:secondary-certs/trust-store-divergence
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egorbaty wants to merge 1 commit into
httpwg:mainfrom
egorbaty:secondary-certs/trust-store-divergence

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@egorbaty

@egorbaty egorbaty commented Nov 4, 2026

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Closes #3576.

Adds a section in security considerations suggesting that secondary certs should be validated with the same scrutiny as a certificate presented in the initial TLS handshake. The text says SHOULD as it may be deliberate to not always do this, but the vast majority of clients should.

A validated authenticator proves only possession of the private key. Use
SHOULD rather than MUST because RFC 9110 Section 4.3.4 allows specially
configured clients and the issue notes divergence can be deliberate.

Fixes httpwg#3576.

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Trust Store Divergence

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