CVE-2026-45309 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-45309HIGH

ronf asyncssh — AsyncSSH `AuthorizedKeysFile %u` path traversal allows attacker-selected authorized keys to authenticate a traversal username

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   N   H   N    8.2   .0044   36.8     —

AFFECTED
  Product   Versions    Fixed
  asyncssh  < 2.23.0 –  —

TIMELINE
  May 11  Reserved by GitHub_M
  Jul 17  EXPLOIT PUBLISHED — CVE-2026-45309 (ronf asyncssh). Public exploit reference added.
  Jul 17  Published (CNA: GitHub_M)
  Jul 30  EXPLOIT PUBLISHED — CVE-2026-45309 (ronf asyncssh). Public exploit reference added.

CWE-22 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py, asyncssh/auth_keys.py, and asyncssh/misc.py with the raw SSH username during pre-authentication server config reload, allowing a server configured with AuthorizedKeysFile authorized_keys/%u to read an authorized-keys file outside the intended directory when the SSH username contains /, \, or .. path traversal segments and authenticate with an attacker-selected key file. This issue is fixed in version 2.23.0.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 11, 2026	Reserved	Reserved by GitHub_M
July 17, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45309 (ronf asyncssh). Public exploit reference added.
July 17, 2026	Published	Published (CNA: GitHub_M)
July 30, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45309 (ronf asyncssh). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
ronf	asyncssh	—	< 2.23.0	—

Weaknesses

CWE-22

References (3)

https://github.com/ronf/asyncssh/commit/2af2382cce946c959a378a62f257af253dc4ab51 [Patch]
https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88 [Patch]
https://github.com/ronf/asyncssh/security/advisories/GHSA-g794-3fmp-753h [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-45309 at cve.org

Vendors: ronf

Weaknesses: CWE-22

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45309 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.