UBUNTU-CVE-2026-4115

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Source
https://ubuntu.com/security/CVE-2026-4115
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-4115
Upstream
  • CVE-2026-4115
Published
2026-03-22T13:16:00Z
Modified
2026-05-20T16:25:41.314258416Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • 2.9 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.

References

Affected packages

Ubuntu:16.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.65-2
0.66-1
0.66-2
0.66-3
0.66-4
0.67-1
0.67-2
0.67-3build0.16.04.1
0.67-3+deb9u1build0.16.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.67-3+deb9u1build0.16.04.1",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.67-3+deb9u1build0.16.04.1",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.67-3+deb9u1build0.16.04.1",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"
Ubuntu:18.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.70-1
0.70-2
0.70-3
0.70-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.70-4",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.70-4",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.70-4",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"
Ubuntu:20.04:LTS
putty

Package

Name
putty
Purl
pkg:deb/ubuntu/putty?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.72-1
0.73-1
0.73-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.73-2",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.73-2",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.73-2",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"
Ubuntu:22.04:LTS
putty

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.75-3
0.76-1
0.76-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.76-2",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.76-2",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.76-2",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"
Ubuntu:24.04:LTS
putty

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.78-3
0.79-1
0.80-1
0.80-1build2
0.80-1build3
0.81-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.81-1",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.81-1",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.81-1",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"
Ubuntu:25.10
putty

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.83-2
0.83-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.83-3",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.83-3",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.83-3",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"
Ubuntu:26.04:LTS
putty

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.83-3
0.83-3build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.83-3build1",
            "binary_name": "pterm"
        },
        {
            "binary_version": "0.83-3build1",
            "binary_name": "putty"
        },
        {
            "binary_version": "0.83-3build1",
            "binary_name": "putty-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4115.json"