CVE-2026-73281Network attack vector

Authenticated remote key use via rejected session binding

Published Aug 11, 2026 · Updated Aug 11, 2026

Authorization bypass in OpenSSH before 10.5 allows remote authenticated users to invoke local-only ssh-agent operations remotely. When agent locking rejects [email protected] requests, ssh-agent fails to identify forwarded clients as remote and permits restricted requests. An attacker needs access to a forwarded agent while it is locked; successful exploitation can add PKCS#11 tokens or use destination-restricted keys.

CVSS severity3.5
Low
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in OpenSSH before 10.5 allows remote authenticated users to invoke local-only ssh-agent operations remotely. When agent locking rejects [email protected] requests, ssh-agent fails to identify forwarded clients as remote and permits restricted requests. An attacker needs access to a forwarded agent while it is locked; successful exploitation can add PKCS#11 tokens or use destination-restricted keys.

The record

CVE
CVE-2026-73281
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
OpenBSD Project
Product
OpenSSH
Classifications
CWE-669, T1021.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=0 <10.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBSD Project · OpenSSHversion=0 <10.5

Published CVSS scores

2.3SUSECVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
3.5MITRE CNACVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N
3.5SUSECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-669Incorrect Resource Transfer Between Spheres
T1021.004Remote Services: SSH

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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