UBUNTU-CVE-2026-40253

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Source
https://ubuntu.com/security/CVE-2026-40253
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40253
Upstream
  • CVE-2026-40253
Published
2026-04-16T23:16:00Z
Modified
2026-05-20T16:25:39.452778571Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: berdecodeINTEGER, berdecodeSEQUENCE, berdecodeOCTETSTRING, berdecodeBITSTRING, and berdecodeCHOICE. Additionally, berdecodeINTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as CCreateObject or CUnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.

References

Affected packages

Ubuntu:16.04:LTS
opencryptoki

Package

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

Affected ranges

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

Affected versions

2.*
2.3.1+dfsg-3ubuntu5
3.*
3.4.1+dfsg-1ubuntu1
3.4.1+dfsg-1ubuntu2
3.4.1+dfsg-1ubuntu3
3.4.1+dfsg-1ubuntu4
3.4.1+dfsg-1ubuntu4.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.4.1+dfsg-1ubuntu4.1"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.4.1+dfsg-1ubuntu4.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"
Ubuntu:18.04:LTS
opencryptoki

Package

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

Affected ranges

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

Affected versions

3.*
3.7.0+dfsg-4
3.8.1+dfsg-2
3.8.1+dfsg-3
3.8.2+dfsg-0ubuntu1
3.9.0+dfsg-0ubuntu1
3.9.0+dfsg-0ubuntu1.1
3.9.0+dfsg-0ubuntu1.2
3.9.0+dfsg-0ubuntu1.3
3.9.0+dfsg-0ubuntu1.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.9.0+dfsg-0ubuntu1.4"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.9.0+dfsg-0ubuntu1.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"
Ubuntu:20.04:LTS
opencryptoki

Package

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

Affected ranges

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

Affected versions

3.*
3.11.1+dfsg-0ubuntu2
3.11.1+dfsg-0ubuntu3
3.12.1+dfsg-0ubuntu1
3.13.0+dfsg-0ubuntu4
3.13.0+dfsg-0ubuntu5
3.13.0+dfsg-0ubuntu5.1
3.13.0+dfsg-0ubuntu5.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.13.0+dfsg-0ubuntu5.2"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.13.0+dfsg-0ubuntu5.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"
Ubuntu:22.04:LTS
opencryptoki

Package

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

Affected ranges

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

Affected versions

3.*
3.16.0+dfsg-0ubuntu1
3.16.0+dfsg-0ubuntu2
3.16.0+dfsg-0ubuntu3
3.17.0+dfsg+20220202.b40982e-0ubuntu1
3.17.0+dfsg+20220202.b40982e-0ubuntu1.1
3.17.0+dfsg+20220202.b40982e-0ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.17.0+dfsg+20220202.b40982e-0ubuntu1.2"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.17.0+dfsg+20220202.b40982e-0ubuntu1.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"
Ubuntu:24.04:LTS
opencryptoki

Package

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

Affected ranges

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

Affected versions

3.*
3.21.0+dfsg-0ubuntu1
3.21.0+dfsg-0ubuntu2
3.22.0+dfsg-0ubuntu1
3.23.0+dfsg-0ubuntu1
3.23.0+dfsg-0ubuntu2
3.23.0+dfsg-0ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.23.0+dfsg-0ubuntu3"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.23.0+dfsg-0ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"
Ubuntu:25.10
opencryptoki

Package

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

Affected ranges

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

Affected versions

3.*
3.24.0+git20250128.0462717+dfsg-0ubuntu1
3.25.0+dfsg-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.25.0+dfsg-0ubuntu1"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.25.0+dfsg-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"
Ubuntu:26.04:LTS
opencryptoki

Package

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

Affected ranges

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

Affected versions

3.*
3.25.0+dfsg-0ubuntu1
3.26.0+dfsg-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libopencryptoki0",
            "binary_version": "3.26.0+dfsg-0ubuntu1"
        },
        {
            "binary_name": "opencryptoki",
            "binary_version": "3.26.0+dfsg-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40253.json"