UBUNTU-CVE-2026-9547

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Source
https://ubuntu.com/security/CVE-2026-9547
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9547.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-9547
Upstream
Downstream
Related
Published
2026-06-24T14:00:00Z
Modified
2026-07-08T09:45:47.261438877Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

When a libcurl-based application performs transfers via SCP:// or SFTP:// and utilizes the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the known_hosts file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.

References

Affected packages

Ubuntu:22.04:LTS / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
7.81.0-1ubuntu1.25

Affected versions

7.*
7.74.0-1.3ubuntu2
7.74.0-1.3ubuntu3
7.80.0-3
7.81.0-1
7.81.0-1ubuntu1.1
7.81.0-1ubuntu1.2
7.81.0-1ubuntu1.3
7.81.0-1ubuntu1.4
7.81.0-1ubuntu1.6
7.81.0-1ubuntu1.7
7.81.0-1ubuntu1.8
7.81.0-1ubuntu1.10
7.81.0-1ubuntu1.11
7.81.0-1ubuntu1.13
7.81.0-1ubuntu1.14
7.81.0-1ubuntu1.15
7.81.0-1ubuntu1.16
7.81.0-1ubuntu1.17
7.81.0-1ubuntu1.18
7.81.0-1ubuntu1.19
7.81.0-1ubuntu1.20
7.81.0-1ubuntu1.21
7.81.0-1ubuntu1.22
7.81.0-1ubuntu1.23
7.81.0-1ubuntu1.24

Ecosystem specific 

{
    "priority_reason": "Upstream defined this as low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "libcurl4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9547.json"

Ubuntu:24.04:LTS / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.5.0-2ubuntu10.10

Affected versions

8.*
8.2.1-1ubuntu3
8.2.1-1ubuntu3.1
8.4.0-2ubuntu1
8.5.0-2ubuntu1
8.5.0-2ubuntu2
8.5.0-2ubuntu8
8.5.0-2ubuntu9
8.5.0-2ubuntu10
8.5.0-2ubuntu10.1
8.5.0-2ubuntu10.2
8.5.0-2ubuntu10.3
8.5.0-2ubuntu10.4
8.5.0-2ubuntu10.5
8.5.0-2ubuntu10.6
8.5.0-2ubuntu10.7
8.5.0-2ubuntu10.8
8.5.0-2ubuntu10.9

Ecosystem specific 

{
    "priority_reason": "Upstream defined this as low severity",
    "binaries": [
        {
            "binary_version": "8.5.0-2ubuntu10.10",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.5.0-2ubuntu10.10",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.5.0-2ubuntu10.10",
            "binary_name": "libcurl4t64"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9547.json"

Ubuntu:25.10 / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.14.1-2ubuntu1.4

Affected versions

8.*
8.12.1-3ubuntu1
8.13.0-5ubuntu1
8.14.1-1ubuntu2
8.14.1-1ubuntu3
8.14.1-2ubuntu1
8.14.1-2ubuntu1.1
8.14.1-2ubuntu1.2
8.14.1-2ubuntu1.3

Ecosystem specific 

{
    "priority_reason": "Upstream defined this as low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "8.14.1-2ubuntu1.4",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.14.1-2ubuntu1.4",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.14.1-2ubuntu1.4",
            "binary_name": "libcurl4t64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9547.json"

Ubuntu:26.04:LTS / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.18.0-1ubuntu2.2

Affected versions

8.*
8.14.1-2ubuntu1
8.17.0-1ubuntu1
8.18.0-1ubuntu1
8.18.0-1ubuntu2
8.18.0-1ubuntu2.1

Ecosystem specific 

{
    "priority_reason": "Upstream defined this as low severity",
    "binaries": [
        {
            "binary_version": "8.18.0-1ubuntu2.2",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.18.0-1ubuntu2.2",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.18.0-1ubuntu2.2",
            "binary_name": "libcurl4t64"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9547.json"