UBUNTU-CVE-2026-49943

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Source
https://ubuntu.com/security/CVE-2026-49943
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-49943
Upstream
Published
2026-06-02T17:16:00Z
Modified
2026-06-12T09:04:21Z
Severity
  • 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

CZ.NIC BIRD Internet Routing Daemon through 2.19.0 contains a stack-based buffer overflow in the BGP AS_PATH mask matching implementation in nest/a-path.c. The as_path_match() function uses a fixed-size stack array of 2048 + 1 pm_pos entries, while parse_path() expands AS_PATH segments from a received BGP UPDATE without enforcing a corresponding capacity limit. When RFC 8654 BGP Extended Messages are enabled and a BIRD filter evaluates an AS path mask expression such as "bgp_path ~ [= ... =]", an established BGP peer can send a long AS_PATH containing more than 2048 expanded ASNs. This causes parse_path()/as_path_match() to write beyond the fixed stack buffer, resulting in a crash of the daemon. NOTE: reportedly, the Supplier's position is that a fix is not being prioritized because all network operators should already be rejecting routes with unusually long attributes.

References

Affected packages

Ubuntu:16.04:LTS
bird

Package

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

Affected ranges

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

Affected versions

1.*
1.5.0-4
1.5.0-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird",
            "binary_version": "1.5.0-4build1"
        },
        {
            "binary_name": "bird-bgp",
            "binary_version": "1.5.0-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
Ubuntu:18.04:LTS
bird

Package

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

Affected ranges

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

Affected versions

1.*
1.6.3-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird",
            "binary_version": "1.6.3-3"
        },
        {
            "binary_name": "bird-bgp",
            "binary_version": "1.6.3-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
Ubuntu:20.04:LTS
bird

Package

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

Affected ranges

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

Affected versions

1.*
1.6.7-1
1.6.8-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird",
            "binary_version": "1.6.8-1"
        },
        {
            "binary_name": "bird-bgp",
            "binary_version": "1.6.8-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
bird2

Package

Name
bird2
Purl
pkg:deb/ubuntu/bird2?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.0.5-1
2.0.7-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird2",
            "binary_version": "2.0.7-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
Ubuntu:22.04:LTS
bird

Package

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

Affected ranges

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

Affected versions

1.*
1.6.8-2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird",
            "binary_version": "1.6.8-2.1"
        },
        {
            "binary_name": "bird-bgp",
            "binary_version": "1.6.8-2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
bird2

Package

Name
bird2
Purl
pkg:deb/ubuntu/bird2?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.0.7-4.1
2.0.8-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird2",
            "binary_version": "2.0.8-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
Ubuntu:24.04:LTS
bird

Package

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

Affected ranges

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

Affected versions

1.*
1.6.8-2.1
1.6.8-2.1build1
1.6.8-2.1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird",
            "binary_version": "1.6.8-2.1build2"
        },
        {
            "binary_name": "bird-bgp",
            "binary_version": "1.6.8-2.1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
bird2

Package

Name
bird2
Purl
pkg:deb/ubuntu/bird2?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.0.12-7
2.14-1
2.14-1build1
2.14-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird2",
            "binary_version": "2.14-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
Ubuntu:25.10
bird2

Package

Name
bird2
Purl
pkg:deb/ubuntu/bird2?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*
2.16.1-1
2.17-1
2.17.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird2",
            "binary_version": "2.17.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
bird3

Package

Name
bird3
Purl
pkg:deb/ubuntu/bird3?arch=source&distro=questing

Affected ranges

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

Affected versions

3.*
3.1.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird3",
            "binary_version": "3.1.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
Ubuntu:26.04:LTS
bird2

Package

Name
bird2
Purl
pkg:deb/ubuntu/bird2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.17.1-1
2.17.2-1
2.17.3-1
2.17.3-2
2.18-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird2",
            "binary_version": "2.18-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"
bird3

Package

Name
bird3
Purl
pkg:deb/ubuntu/bird3?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.1.0-1
3.1.4-1
3.1.5-1
3.1.5-2
3.2.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "bird3",
            "binary_version": "3.2.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49943.json"