Vulnerability-Lookup

OESA-2026-3747 (CVE-2026-73281)

Vulnerability from osv_openeuler – Published: 2026-09-14 16:33 – Updated: 2026-09-14 16:33 – Source website

Summary

openssh security update

Details

An open source implementation of SSH protocol version 2

Security Fix(es):

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 (CVE-2026-73281)

In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forwarding operations are concurrent.(CVE-2026-73282)

In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.(CVE-2026-73283)

Severity

4.8 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-73281	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-73282	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-73283	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "openssh-9.6p1-26.oe2403sp4.aarch64.rpm",
          "openssh-askpass-9.6p1-26.oe2403sp4.aarch64.rpm",
          "openssh-clients-9.6p1-26.oe2403sp4.aarch64.rpm",
          "openssh-debuginfo-9.6p1-26.oe2403sp4.aarch64.rpm",
          "openssh-debugsource-9.6p1-26.oe2403sp4.aarch64.rpm",
          "openssh-keycat-9.6p1-26.oe2403sp4.aarch64.rpm",
          "openssh-server-9.6p1-26.oe2403sp4.aarch64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.26.oe2403sp4.aarch64.rpm"
        ],
        "noarch": [
          "openssh-help-9.6p1-26.oe2403sp4.noarch.rpm"
        ],
        "src": [
          "openssh-9.6p1-26.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "openssh-9.6p1-26.oe2403sp4.x86_64.rpm",
          "openssh-askpass-9.6p1-26.oe2403sp4.x86_64.rpm",
          "openssh-clients-9.6p1-26.oe2403sp4.x86_64.rpm",
          "openssh-debuginfo-9.6p1-26.oe2403sp4.x86_64.rpm",
          "openssh-debugsource-9.6p1-26.oe2403sp4.x86_64.rpm",
          "openssh-keycat-9.6p1-26.oe2403sp4.x86_64.rpm",
          "openssh-server-9.6p1-26.oe2403sp4.x86_64.rpm",
          "pam_ssh_agent_auth-0.10.4-5.26.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "openssh",
        "purl": "pkg:rpm/openEuler/openssh\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.6p1-26.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "An open source implementation of SSH protocol version 2\r\n\r\nSecurity Fix(es):\n\nIn 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 (CVE-2026-73281)\n\nIn ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forwarding operations are concurrent.(CVE-2026-73282)\n\nIn sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.(CVE-2026-73283)",
  "id": "OESA-2026-3747",
  "modified": "2026-09-14T16:33:57Z",
  "published": "2026-09-14T16:33:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3747"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73281"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73282"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73283"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "openssh security update",
  "upstream": [
    "CVE-2026-73281",
    "CVE-2026-73282",
    "CVE-2026-73283"
  ]
}

CVE-2026-73281 (GCVE-0-2026-73281)

Vulnerability from cvelistv5 – Published: 2026-08-11 19:10 – Updated: 2026-08-11 20:16

Summary

Severity

3.5 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 20:16 UTC

CWE

CWE-669 - Incorrect Resource Transfer Between Spheres

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://www.openssh.org/releasenotes.html#10.5

Impacted products

1 product

Vendor	Product	Version
OpenBSD	OpenSSH	Affected: 0 , < 10.5 (custom) cpe:2.3:a:openbsd:openssh::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
          {
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                "id": "CVE-2026-73281",
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CVE-2026-73282 (GCVE-0-2026-73282)

Vulnerability from cvelistv5 – Published: 2026-08-11 19:12 – Updated: 2026-08-11 20:17

Summary

In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forwarding operations are concurrent.

Severity

4.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 20:17 UTC

CWE

CWE-416 - Use After Free

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://www.openssh.org/releasenotes.html#10.5

Impacted products

1 product

Vendor	Product	Version
OpenBSD	OpenSSH	Affected: 0 , < 10.5 (custom) cpe:2.3:a:openbsd:openssh::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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                  },
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                "timestamp": "2026-08-11T20:17:11.294681Z",
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CVE-2026-73283 (GCVE-0-2026-73283)

Vulnerability from cvelistv5 – Published: 2026-08-11 19:15 – Updated: 2026-08-11 20:16

Summary

In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.

Severity

2.5 (Low)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 20:16 UTC

CWE

CWE-670 - Always-Incorrect Control Flow Implementation

Assigner

mitre mitre root

References

1 reference

URL	Tags
https://www.openssh.org/releasenotes.html#10.5

Impacted products

1 product

Vendor	Product	Version
OpenBSD	OpenSSH	Affected: 0 , < 10.5 (custom) cpe:2.3:a:openbsd:openssh::::::::

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-3747 (CVE-2026-73281)

CVE-2026-73281 (GCVE-0-2026-73281)

CVE-2026-73282 (GCVE-0-2026-73282)

CVE-2026-73283 (GCVE-0-2026-73283)

Tags

Sightings

Nomenclature

Related by attack behaviour