UBUNTU-CVE-2026-63073

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-63073
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-63073
Upstream
Downstream
Related
Published
2026-08-25T00:00:00Z
Modified
2026-09-02T19:41:08Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directly as the format string to ERR_raise_data(). Impact summary: A malicious or intercepted CMP endpoint can crash a CMP client that enforces an expected sender or uses a pinned server certificate whose subject becomes the default expected sender. CWE: CWE-134 (Use of Externally-Controlled Format String) Description: When validating a received CMP message, ossl_cmp_msg_check_update() converts the peer-supplied sender distinguished name with X509_NAME_oneline() and passes it directly as the format argument to ERR_raise_data(). Percent characters survive the conversion, so a sender DN such as "CN=%s%n" reaches BIO_vsnprintf() as an attacker-controlled format string with no matching variadic arguments. This path is only reached when the caller configures an expected sender or pins a server certificate, which is the normal configuration for a CMP client validating server responses. Since the attacker controls the format string but none of the variadic arguments, such specifiers as %s and %n dereference or write through unrelated stack contents and crash the client. The reliable consequence is a denial of service, when the response comes from a malicious or intercepted CMP endpoint. There is no controlled memory write, arbitrary-address read, or reliable path to remote code execution. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

References

Affected packages

Ubuntu:26.04:LTS
edk2

Package

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

Affected ranges

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

Affected versions

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

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"
edk2-hwe

Package

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

Affected ranges

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

Affected versions

2025.*
2025.11-3ubuntu6
2025.11-3ubuntu8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efi-shell-aa64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "efi-shell-loongarch64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "efi-shell-riscv64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "efi-shell-x64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "ovmf-amdsev-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "ovmf-generic-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "ovmf-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "ovmf-inteltdx-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "ovmf-legacy-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "qemu-efi-aarch64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "qemu-efi-loongarch64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        },
        {
            "binary_name": "qemu-efi-riscv64-hwe",
            "binary_version": "2025.11-3ubuntu8"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"
openssl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.5.5-1ubuntu3.4

Affected versions

3.*
3.5.3-1ubuntu2
3.5.5-1ubuntu1
3.5.5-1ubuntu3
3.5.5-1ubuntu3.2
3.5.5-1ubuntu3.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssl3t64",
            "binary_version": "3.5.5-1ubuntu3.4"
        },
        {
            "binary_name": "openssl",
            "binary_version": "3.5.5-1ubuntu3.4"
        },
        {
            "binary_name": "openssl-provider-legacy",
            "binary_version": "3.5.5-1ubuntu3.4"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"
Ubuntu:Pro:16.04:LTS
nodejs

Package

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

Affected ranges

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

Affected versions

0.*
0.10.25~dfsg2-2ubuntu1
4.*
4.2.2~dfsg-1
4.2.3~dfsg-1
4.2.4~dfsg-1ubuntu1
4.2.4~dfsg-2
4.2.6~dfsg-1ubuntu1
4.2.6~dfsg-1ubuntu4
4.2.6~dfsg-1ubuntu4.1
4.2.6~dfsg-1ubuntu4.2
4.2.6~dfsg-1ubuntu4.2+esm1
4.2.6~dfsg-1ubuntu4.2+esm2
4.2.6~dfsg-1ubuntu4.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nodejs",
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3"
        },
        {
            "binary_name": "nodejs-legacy",
            "binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"
Ubuntu:Pro:18.04:LTS
nodejs

Package

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

Affected ranges

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

Affected versions

6.*
6.11.4~dfsg-1ubuntu1
6.11.4~dfsg-1ubuntu2
6.12.0~dfsg-1ubuntu1
6.12.0~dfsg-2ubuntu1
6.12.0~dfsg-2ubuntu2
8.*
8.10.0~dfsg-2
8.10.0~dfsg-2ubuntu0.2
8.10.0~dfsg-2ubuntu0.3
8.10.0~dfsg-2ubuntu0.4
8.10.0~dfsg-2ubuntu0.4+esm1
8.10.0~dfsg-2ubuntu0.4+esm2
8.10.0~dfsg-2ubuntu0.4+esm3
8.10.0~dfsg-2ubuntu0.4+esm4
8.10.0~dfsg-2ubuntu0.4+esm5
8.10.0~dfsg-2ubuntu0.4+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "nodejs",
            "binary_version": "8.10.0~dfsg-2ubuntu0.4+esm6"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"
Ubuntu:Pro:FIPS-preview:22.04:LTS
openssl-fips

Package

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

Affected ranges

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

Affected versions

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

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"
Ubuntu:Pro:FIPS-updates:22.04:LTS
openssl-fips

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.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
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.0.13-0ubuntu3+Fips1
3.0.13-0ubuntu3.6+Fips1
3.0.13-0ubuntu3.12+Fips1
3.0.13-0ubuntu3.15+Fips1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssl-fips-module-3",
            "binary_version": "3.0.13-0ubuntu3.15+Fips1"
        }
    ],
    "priority_reason": "OpenSSL developers have rated this low severity"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-63073.json"