UBUNTU-CVE-2026-5123

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Source
https://ubuntu.com/security/CVE-2026-5123
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5123
Upstream
Published
2026-03-30T16:16:00Z
Modified
2026-06-03T07:15:34Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A weakness has been identified in osrg GoBGP up to 4.3.0. This impacts the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. Executing a manipulation of the argument data[1] can lead to off-by-one. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is said to be difficult. This patch is called 67c059413470df64bc20801c46f64058e88f800f. A patch should be applied to remediate this issue.

References

Affected packages

Ubuntu:25.10
gobgp

Package

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

Affected ranges

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

Affected versions

3.*
3.35.0-1
3.36.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gobgpd",
            "binary_version": "3.36.0-2"
        },
        {
            "binary_name": "golang-github-osrg-gobgp-dev",
            "binary_version": "3.36.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json"
Ubuntu:Pro:18.04:LTS
gobgp

Package

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

Affected ranges

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

Affected versions

1.*
1.15-1
1.29-1
1.29-1ubuntu0.1+esm1
1.29-1ubuntu0.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gobgpd",
            "binary_version": "1.29-1ubuntu0.1+esm2"
        },
        {
            "binary_name": "golang-github-osrg-gobgp-dev",
            "binary_version": "1.29-1ubuntu0.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json"
Ubuntu:Pro:20.04:LTS
gobgp

Package

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

Affected ranges

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

Affected versions

1.*
1.33-1
2.*
2.11.0-1
2.12.0-1
2.12.0-1ubuntu0.1~esm1
2.12.0-1ubuntu0.1~esm2
2.12.0-1ubuntu0.1~esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gobgpd",
            "binary_version": "2.12.0-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "golang-github-osrg-gobgp-dev",
            "binary_version": "2.12.0-1ubuntu0.1~esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json"
Ubuntu:Pro:22.04:LTS
gobgp

Package

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

Affected ranges

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

Affected versions

2.*
2.25.0-2
2.25.0-3
2.25.0-3build1
2.25.0-3ubuntu0.1
2.25.0-3ubuntu0.1+esm1
2.25.0-3ubuntu0.1+esm2
2.25.0-3ubuntu0.1+esm3
2.25.0-3ubuntu0.1+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gobgpd",
            "binary_version": "2.25.0-3ubuntu0.1+esm4"
        },
        {
            "binary_name": "golang-github-osrg-gobgp-dev",
            "binary_version": "2.25.0-3ubuntu0.1+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json"
Ubuntu:Pro:24.04:LTS
gobgp

Package

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

Affected ranges

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

Affected versions

3.*
3.16.0-1build1
3.19.0-1
3.21.0-1
3.23.0-1
3.23.0-1ubuntu0.1
3.23.0-1ubuntu0.2
3.23.0-1ubuntu0.2+esm1
3.23.0-1ubuntu0.3
3.23.0-1ubuntu0.3+esm1
3.23.0-1ubuntu0.3+esm2
3.23.0-1ubuntu0.3+esm3
3.23.0-1ubuntu0.3+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gobgpd",
            "binary_version": "3.23.0-1ubuntu0.3+esm4"
        },
        {
            "binary_name": "golang-github-osrg-gobgp-dev",
            "binary_version": "3.23.0-1ubuntu0.3+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json"
Ubuntu:Pro:26.04:LTS
gobgp

Package

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

Affected ranges

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

Affected versions

3.*
3.36.0-2
3.36.0-2build1
3.36.0-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gobgpd",
            "binary_version": "3.36.0-2ubuntu0.1~esm1"
        },
        {
            "binary_name": "golang-github-osrg-gobgp-dev",
            "binary_version": "3.36.0-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5123.json"