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tailcat: reject meows with a zero disco key - #55

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bradfitz merged 1 commit into
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bradfitz/meow_fix
Aug 31, 2026
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tailcat: reject meows with a zero disco key#55
bradfitz merged 1 commit into
mainfrom
bradfitz/meow_fix

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@bradfitz bradfitz commented Aug 31, 2026

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A zero disco key reaches endpoint advertisement, where deriving the
shared secret panics. Reject it while parsing the unauthenticated DERP
packet.

Reported-By: Dinnerb0ne

A zero disco key reaches endpoint advertisement, where deriving the
shared secret panics. Reject it while parsing the unauthenticated DERP
packet.

Reported-By: Dinnerb0ne <tomma_2022@outlook.com>
@bradfitz
bradfitz merged commit 79da910 into main Aug 31, 2026
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