CVE-2026-45309
AsyncSSH path traversal in %u expansion allows authentication bypass.
Is CVE-2026-45309 being exploited?
Not confirmed. CVE-2026-45309 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-45309?
CVE-2026-45309 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-45309?
Yes. A fix has been recorded for CVE-2026-45309. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45309 affect?
CVE-2026-45309 affects AsyncSSH < 2.23.0, Applications embedding AsyncSSH for SSH servers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45309?
Upgrade AsyncSSH to >=2.23.0; validate AuthorizedKeysFile usage
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Pre-auth path traversal in AuthorizedKeysFile %u lets attackers reference attacker-controlled key files to authenticate as arbitrary users.
Patch when possible
- affected< 2.23.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.