OpenBSD OpenSSH up to 10.4 ssh-agent locking

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in OpenBSD OpenSSH up to 10.4. This impacts an unknown function of the component ssh-agent. Performing a manipulation results in locking. This vulnerability is known as CVE-2026-73281. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in OpenBSD OpenSSH up to 10.4. This affects some unknown processing of the component ssh-agent. The manipulation with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In ssh-agent in OpenSSH before 10.5, some operations can occur remotely but were intended to occur only locally, including operations that add tokens or use keys. This is caused by misinteraction between agent locking and the [email protected] extension.

The advisory is shared at openssh.org. This vulnerability is uniquely identified as CVE-2026-73281 since 08/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/11/2026).

The vulnerability scanner Nessus provides a plugin with the ID 344614 (Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS : OpenSSH vulnerabilities (USN-8721-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 10.5 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (344614) and CERT Bund (WID-SEC-2026-2747). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Open Source OpenSSH

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.5
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Locking
CWE: CWE-667
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 344614
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS : OpenSSH vulnerabilities (USN-8721-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenSSH 10.5

Timelineinfo

08/11/2026 Advisory disclosed
08/11/2026 +0 days CVE reserved
08/11/2026 +0 days VulDB entry created
09/11/2026 +31 days VulDB entry last update

Sourcesinfo

Vendor: openbsd.org

Advisory: openssh.org
Status: Confirmed

CVE: CVE-2026-73281 (🔒)
GCVE (CVE): GCVE-0-2026-73281
GCVE (VulDB): GCVE-100-388485
CERT Bund: WID-SEC-2026-2747 - OpenSSH: Mehrere Schwachstellen

Entryinfo

Created: 08/11/2026 21:41
Updated: 09/11/2026 03:14
Changes: 08/11/2026 21:41 (55), 08/12/2026 04:46 (7), 09/02/2026 13:17 (11), 09/11/2026 03:14 (2)
Complete: 🔍
Cache ID: 216::103

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