CVE-2026-45309Public exploitNetwork attack vector

Unauthenticated SSH access via authorized-keys path traversal

Published Jul 17, 2026 · Updated Jul 17, 2026

Path traversal in Ron Frederick AsyncSSH before 2.23.0 allows remote attackers to gain SSH access via a crafted username. AuthorizedKeysFile %u expansion inserts the raw pre-authentication username into a key-file path and opens the result outside its configured directory. Exploitation requires public-key authentication, a %u-based key pattern, and a readable attacker-selected key file; success authenticates the traversal username.

CVSS severity8.2
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Ron Frederick AsyncSSH before 2.23.0 allows remote attackers to gain SSH access via a crafted username. AuthorizedKeysFile %u expansion inserts the raw pre-authentication username into a key-file path and opens the result outside its configured directory. Exploitation requires public-key authentication, a %u-based key pattern, and a readable attacker-selected key file; success authenticates the traversal username.

The record

CVE
CVE-2026-45309
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Ron Frederick
Product
AsyncSSH
Classifications
CWE-22, CAPEC-126, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ron Frederick · AsyncSSHversion=< 2.23.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
8.2GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
5.9Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
6.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-126Path Traversal
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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