UBUNTU-CVE-2026-42770

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Source
https://ubuntu.com/security/CVE-2026-42770
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-42770
Upstream
Downstream
Related
Published
2026-06-09T00:00:00Z
Modified
2026-06-12T09:11:46.330559389Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

Issue summary: When EVPPKEYderivesetpeer() is called with a DHX (X9.42) peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r (a small prime factor of the cofactor (p−1)/qlocal), and a public value Y of order r can recover the victim's private key after a small number of key exchange attempts. When EVPPKEYderiveset_peer() is called with a DHX (X9.42) peer key, the subgroup membership check Y^q ≡ 1 (mod p) is performed using the peer's own q parameter, not the local key's q. The peer's domain parameters are then matched against the domain parameters of the private key, but the value of q is not compared. A malicious peer who presents an X9.42 key carrying the victim's p, g, a forged q = r (a small prime factor of the cofactor), and a public value Y of order r passes all checks. The shared secret then takes only r distinct values, leaking priv mod r. Repeating for each small-prime factor of the cofactor and combining via CRT recovers the full private key (Lim–Lee / small-subgroup-confinement attack). The realistic attack surface is narrow: principally CMP deployments with long-lived RA/CA DHX keys and bespoke enterprise or government applications using X9.42 DHX static keys with interactive protocols and therefore this issue was assigned Low severity. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are affected by this issue.

References

Affected packages

Ubuntu:22.04:LTS
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.2-0ubuntu1.25

Affected versions

1.*
1.1.1l-1ubuntu1
3.*
3.0.0-1ubuntu1
3.0.1-0ubuntu1
3.0.2-0ubuntu1
3.0.2-0ubuntu1.1
3.0.2-0ubuntu1.2
3.0.2-0ubuntu1.4
3.0.2-0ubuntu1.5
3.0.2-0ubuntu1.6
3.0.2-0ubuntu1.7
3.0.2-0ubuntu1.8
3.0.2-0ubuntu1.9
3.0.2-0ubuntu1.10
3.0.2-0ubuntu1.12
3.0.2-0ubuntu1.13
3.0.2-0ubuntu1.14
3.0.2-0ubuntu1.15
3.0.2-0ubuntu1.16
3.0.2-0ubuntu1.17
3.0.2-0ubuntu1.18
3.0.2-0ubuntu1.19
3.0.2-0ubuntu1.20
3.0.2-0ubuntu1.21
3.0.2-0ubuntu1.23

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl3",
            "binary_version": "3.0.2-0ubuntu1.25"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.0.2-0ubuntu1.25"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:24.04:LTS
edk2

Package

Name
edk2
Purl
pkg:deb/ubuntu/edk2?arch=source&distro=noble

Affected ranges

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

Affected versions

2023.*
2023.05-2
2023.11-2
2023.11-3
2023.11-4
2023.11-5
2023.11-6
2023.11-8
2024.*
2024.02-1
2024.02-2
2024.02-2ubuntu0.1
2024.02-2ubuntu0.3
2024.02-2ubuntu0.4
2024.02-2ubuntu0.5
2024.02-2ubuntu0.6
2024.02-2ubuntu0.7
2024.02-2ubuntu0.8

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_version": "2024.02-2ubuntu0.8",
            "binary_name": "efi-shell-aa64"
        },
        {
            "binary_version": "2024.02-2ubuntu0.8",
            "binary_name": "efi-shell-arm"
        },
        {
            "binary_name": "efi-shell-ia32",
            "binary_version": "2024.02-2ubuntu0.8"
        },
        {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2024.02-2ubuntu0.8"
        },
        {
            "binary_name": "efi-shell-x64",
            "binary_version": "2024.02-2ubuntu0.8"
        },
        {
            "binary_version": "2024.02-2ubuntu0.8",
            "binary_name": "ovmf"
        },
        {
            "binary_name": "ovmf-ia32",
            "binary_version": "2024.02-2ubuntu0.8"
        },
        {
            "binary_version": "2024.02-2ubuntu0.8",
            "binary_name": "ovmf-legacy"
        },
        {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2024.02-2ubuntu0.8"
        },
        {
            "binary_name": "qemu-efi-arm",
            "binary_version": "2024.02-2ubuntu0.8"
        },
        {
            "binary_name": "qemu-efi-riscv64",
            "binary_version": "2024.02-2ubuntu0.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.13-0ubuntu3.11

Affected versions

3.*
3.0.10-1ubuntu2
3.0.10-1ubuntu2.1
3.0.10-1ubuntu3
3.0.10-1ubuntu4
3.0.13-0ubuntu2
3.0.13-0ubuntu3
3.0.13-0ubuntu3.1
3.0.13-0ubuntu3.2
3.0.13-0ubuntu3.3
3.0.13-0ubuntu3.4
3.0.13-0ubuntu3.5
3.0.13-0ubuntu3.6
3.0.13-0ubuntu3.7
3.0.13-0ubuntu3.9

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl3t64",
            "binary_version": "3.0.13-0ubuntu3.11"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.0.13-0ubuntu3.11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:25.10
edk2

Package

Name
edk2
Purl
pkg:deb/ubuntu/edk2?arch=source&distro=questing

Affected ranges

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

Affected versions

2025.*
2025.02-3ubuntu2
2025.02-8
2025.02-8ubuntu1
2025.02-8ubuntu2
2025.02-8ubuntu3
2025.02-8ubuntu3.1

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_name": "efi-shell-aa64",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "efi-shell-arm",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "efi-shell-ia32",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "efi-shell-loongarch64",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "efi-shell-x64",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_version": "2025.02-8ubuntu3.1",
            "binary_name": "ovmf"
        },
        {
            "binary_name": "ovmf-ia32",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "ovmf-inteltdx",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "ovmf-legacy",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_name": "qemu-efi-arm",
            "binary_version": "2025.02-8ubuntu3.1"
        },
        {
            "binary_version": "2025.02-8ubuntu3.1",
            "binary_name": "qemu-efi-loongarch64"
        },
        {
            "binary_name": "qemu-efi-riscv64",
            "binary_version": "2025.02-8ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.3-1ubuntu3.4

Affected versions

3.*
3.4.1-1ubuntu3
3.5.0-2ubuntu1
3.5.2-1ubuntu1
3.5.3-1ubuntu2
3.5.3-1ubuntu3
3.5.3-1ubuntu3.3

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.3-1ubuntu3.4"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.5.3-1ubuntu3.4"
        },
        {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.3-1ubuntu3.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:26.04:LTS
edk2

Package

Name
edk2
Purl
pkg:deb/ubuntu/edk2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2025.*
2025.02-8ubuntu3
2025.11-3ubuntu6
2025.11-3ubuntu7

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "efi-shell-aa64"
        },
        {
            "binary_name": "efi-shell-loongarch64",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_name": "efi-shell-riscv64",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_name": "efi-shell-x64",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_name": "ovmf",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_name": "ovmf-amdsev",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_name": "ovmf-generic",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf-inteltdx"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "ovmf-legacy"
        },
        {
            "binary_name": "qemu-efi-aarch64",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_name": "qemu-efi-loongarch64",
            "binary_version": "2025.11-3ubuntu7"
        },
        {
            "binary_version": "2025.11-3ubuntu7",
            "binary_name": "qemu-efi-riscv64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.5-1ubuntu3.2

Affected versions

3.*
3.5.3-1ubuntu2
3.5.5-1ubuntu1
3.5.5-1ubuntu3

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.5-1ubuntu3.2"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.5.5-1ubuntu3.2"
        },
        {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.5-1ubuntu3.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:Pro:22.04:LTS
nodejs

Package

Name
nodejs
Purl
pkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

12.*
12.22.5~dfsg-5ubuntu1
12.22.7~dfsg-2ubuntu1
12.22.7~dfsg-2ubuntu3
12.22.9~dfsg-1ubuntu2
12.22.9~dfsg-1ubuntu3
12.22.9~dfsg-1ubuntu3.1
12.22.9~dfsg-1ubuntu3.2
12.22.9~dfsg-1ubuntu3.3
12.22.9~dfsg-1ubuntu3.4
12.22.9~dfsg-1ubuntu3.5
12.22.9~dfsg-1ubuntu3.6
12.22.9~dfsg-1ubuntu3.6+esm2

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_name": "libnode72",
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
        },
        {
            "binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2",
            "binary_name": "nodejs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:Pro:FIPS-preview:22.04:LTS
openssl

Package

Name
openssl
Purl
pkg:deb/ubuntu/openssl?arch=source&distro=fips-preview%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.2-0ubuntu1.10+Fips1
3.0.2-0ubuntu1.12+Fips1

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_name": "libssl3",
            "binary_version": "3.0.2-0ubuntu1.12+Fips1"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.0.2-0ubuntu1.12+Fips1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
openssl-fips

Package

Name
openssl-fips
Purl
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-preview%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.5-0ubuntu0.1+Fips2.1

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_name": "openssl-fips-module-3",
            "binary_version": "3.0.5-0ubuntu0.1+Fips2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:Pro:FIPS-updates:22.04:LTS
openssl

Package

Name
openssl
Purl
pkg:deb/ubuntu/openssl?arch=source&distro=fips-updates%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.2-0ubuntu1.10+Fips1
3.0.2-0ubuntu1.12+Fips1
3.0.2-0ubuntu1.14+Fips1
3.0.2-0ubuntu1.15+Fips1
3.0.2-0ubuntu1.16+Fips1
3.0.2-0ubuntu1.17+Fips1
3.0.2-0ubuntu1.18+Fips1
3.0.2-0ubuntu1.19+Fips1
3.0.2-0ubuntu1.20+Fips1
3.0.2-0ubuntu1.21+Fips1
3.0.2-0ubuntu1.23+Fips1

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_name": "libssl3",
            "binary_version": "3.0.2-0ubuntu1.23+Fips1"
        },
        {
            "binary_version": "3.0.2-0ubuntu1.23+Fips1",
            "binary_name": "openssl"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
openssl-fips

Package

Name
openssl-fips
Purl
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-updates%2Fjammy

Affected ranges

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

Affected versions

3.*
3.0.5-0ubuntu0.1+Fips2.1
3.0.5-0ubuntu0.2+Fips1

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_version": "3.0.5-0ubuntu0.2+Fips1",
            "binary_name": "openssl-fips-module-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"
Ubuntu:Pro:FIPS-updates:24.04:LTS
openssl-fips

Package

Name
openssl-fips
Purl
pkg:deb/ubuntu/openssl-fips?arch=source&distro=fips-updates%2Fnoble

Affected ranges

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

Affected versions

3.*
3.0.13-0ubuntu3+Fips1
3.0.13-0ubuntu3.6+Fips1

Ecosystem specific 

{
    "priority_reason": "OpenSSL developers have rated this as being low severity",
    "binaries": [
        {
            "binary_name": "openssl-fips-module-3",
            "binary_version": "3.0.13-0ubuntu3.6+Fips1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42770.json"