UBUNTU-CVE-2026-39853

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Source
https://ubuntu.com/security/CVE-2026-39853
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-39853
Upstream
  • CVE-2026-39853
Published
2026-04-09T16:16:00Z
Modified
2026-04-16T09:13:14Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.12, A stack buffer overflow vulnerability exists in osslsigncode in several signature verification paths. During verification of a PKCS#7 signature, the code copies the digest value from a parsed SpcIndirectDataContent structure into a fixed-size stack buffer (mdbuf[EVPMAXMD_SIZE], 64 bytes) without validating that the source length fits within the destination buffer. This pattern is present in the verification handlers for PE, MSI, CAB, and script files. An attacker can craft a malicious signed file with an oversized digest field in SpcIndirectDataContent. When a user verifies such a file with osslsigncode verify, the unbounded memcpy can overflow the stack buffer and corrupt adjacent stack state. This vulnerability is fixed in 2.12.

References

Affected packages

Ubuntu:16.04:LTS
osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/ubuntu/osslsigncode@1.7.1-1?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.7.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "osslsigncode",
            "binary_version": "1.7.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json"
Ubuntu:18.04:LTS
osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/ubuntu/osslsigncode@1.7.1-3?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.7.1-2build1
1.7.1-2ubuntu1
1.7.1-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "osslsigncode",
            "binary_version": "1.7.1-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json"
Ubuntu:20.04:LTS
osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/ubuntu/osslsigncode@2.0-1?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "osslsigncode",
            "binary_version": "2.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json"
Ubuntu:22.04:LTS
osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/ubuntu/osslsigncode@2.2-1ubuntu1?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.1-1
2.2-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "osslsigncode",
            "binary_version": "2.2-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json"
Ubuntu:24.04:LTS
osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/ubuntu/osslsigncode@2.8-2?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.5-4
2.8-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "osslsigncode",
            "binary_version": "2.8-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json"
Ubuntu:25.10
osslsigncode

Package

Name
osslsigncode
Purl
pkg:deb/ubuntu/osslsigncode@2.9-2?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*
2.9-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "osslsigncode",
            "binary_version": "2.9-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39853.json"