UBUNTU-CVE-2026-87121

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Source
https://ubuntu.com/security/CVE-2026-87121
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87121.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-87121
Upstream
  • CVE-2026-87121
Published
2026-09-22T20:17:00Z
Modified
2026-09-24T02:00:37Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.

References

Affected packages

Ubuntu:Pro:20.04:LTS / lwip

Package

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

Affected ranges

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

Affected versions

2.*
2.1.2-3
2.1.2-5.1
2.1.2+dfsg1-1
2.1.2+dfsg1-4
2.1.2+dfsg1-4ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblwip0",
            "binary_version":  "2.1.2+dfsg1-4ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87121.json"

Ubuntu:Pro:22.04:LTS / lwip

Package

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

Affected ranges

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

Affected versions

2.*
2.1.2+dfsg1-8
2.1.2+dfsg1-9
2.1.3+dfsg1-1
2.1.3+dfsg1-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblwip0",
            "binary_version":  "2.1.3+dfsg1-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87121.json"

Ubuntu:Pro:24.04:LTS / lwip

Package

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

Affected ranges

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

Affected versions

2.*
2.1.3+dfsg1-2
2.1.3+dfsg1-4
2.2.0+dfsg1-2
2.2.0+dfsg1-3
2.2.0+dfsg1-4
2.2.0+dfsg1-5
2.2.0+dfsg1-6
2.2.0+dfsg1-6.1
2.2.0+dfsg1-6.1build1
2.2.0+dfsg1-6.1build2
2.2.0+dfsg1-6.1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblwip0t64",
            "binary_version":  "2.2.0+dfsg1-6.1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87121.json"

Ubuntu:Pro:26.04:LTS / lwip

Package

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

Affected ranges

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

Affected versions

2.*
2.2.1+dfsg1-2
2.2.1+dfsg1-3
2.2.1+dfsg1-4
2.2.1+dfsg1-4ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblwip0t64",
            "binary_version":  "2.2.1+dfsg1-4ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-87121.json"