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GitHub Advisories20
asyncssh has an incomplete fix for CVE-2026-45309 — AuthorizedKeysFile %u still escapes the intended directory via a leading ~ (and weakly via ${ENV}) username substitution

**Incomplete fix for CVE-2026-45309 (GHSA-g794-3fmp-753h).** The 2.23.0 guard that sanitises the SSH username before `%u` substitution in `AuthorizedKeysFile` blocks `/`, `\` and `..`, but does not block a leading `~` (or `${ENV}`), both of which are re-introduced by later expansion and reach the...

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