UBUNTU-CVE-2026-5745

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Source
https://ubuntu.com/security/CVE-2026-5745
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5745.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5745
Upstream
  • CVE-2026-5745
Downstream
Related
Published
2026-04-07T16:16:00Z
Modified
2026-07-23T01:15:36Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare "d" or "default" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS).

References

Affected packages

Ubuntu:Pro:20.04:LTS / libarchive

Package

Name
libarchive
Purl
pkg:deb/ubuntu/libarchive?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.4.0-2ubuntu1.5+esm3

Affected versions

3.*
3.4.0-1
3.4.0-1build1
3.4.0-1ubuntu2
3.4.0-2ubuntu1
3.4.0-2ubuntu1.1
3.4.0-2ubuntu1.2
3.4.0-2ubuntu1.3
3.4.0-2ubuntu1.4
3.4.0-2ubuntu1.5
3.4.0-2ubuntu1.5+esm1
3.4.0-2ubuntu1.5+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libarchive-tools",
            "binary_version": "3.4.0-2ubuntu1.5+esm3"
        },
        {
            "binary_name": "libarchive13",
            "binary_version": "3.4.0-2ubuntu1.5+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5745.json"

Ubuntu:22.04:LTS / libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.6.0-1ubuntu1.8

Affected versions

3.*
3.4.3-2
3.4.3-2build1
3.5.2-1
3.5.2-1ubuntu1
3.6.0-1ubuntu1
3.6.0-1ubuntu1.1
3.6.0-1ubuntu1.2
3.6.0-1ubuntu1.3
3.6.0-1ubuntu1.4
3.6.0-1ubuntu1.5
3.6.0-1ubuntu1.6
3.6.0-1ubuntu1.7

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libarchive-tools",
            "binary_version": "3.6.0-1ubuntu1.8"
        },
        {
            "binary_name": "libarchive13",
            "binary_version": "3.6.0-1ubuntu1.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5745.json"

Ubuntu:24.04:LTS / libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.7.2-2ubuntu0.8

Affected versions

3.*
3.6.2-1ubuntu1
3.7.2-1ubuntu1
3.7.2-1ubuntu2
3.7.2-1.1ubuntu2
3.7.2-2
3.7.2-2ubuntu0.1
3.7.2-2ubuntu0.2
3.7.2-2ubuntu0.3
3.7.2-2ubuntu0.4
3.7.2-2ubuntu0.5
3.7.2-2ubuntu0.6
3.7.2-2ubuntu0.7

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libarchive-tools",
            "binary_version": "3.7.2-2ubuntu0.8"
        },
        {
            "binary_name": "libarchive13t64",
            "binary_version": "3.7.2-2ubuntu0.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5745.json"

Ubuntu:25.10 / libarchive

Package

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

Affected ranges

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

Affected versions

3.*
3.7.7-0ubuntu2
3.7.7-0ubuntu2.1
3.7.7-0ubuntu2.2
3.7.7-0ubuntu3
3.7.7-0ubuntu3.1
3.7.7-0ubuntu3.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libarchive-tools",
            "binary_version": "3.7.7-0ubuntu3.2"
        },
        {
            "binary_name": "libarchive13t64",
            "binary_version": "3.7.7-0ubuntu3.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5745.json"

Ubuntu:26.04:LTS / libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.8.5-1ubuntu2.2

Affected versions

3.*
3.7.7-0ubuntu3
3.8.5-1ubuntu1
3.8.5-1ubuntu2
3.8.5-1ubuntu2.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libarchive-tools",
            "binary_version": "3.8.5-1ubuntu2.2"
        },
        {
            "binary_name": "libarchive13t64",
            "binary_version": "3.8.5-1ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5745.json"