UBUNTU-CVE-2026-120830

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Source
https://ubuntu.com/security/CVE-2026-120830
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-120830
Upstream
Published
2026-11-03T00:00:00Z
Modified
2026-11-04T03:30:46Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.

References

Affected packages

Ubuntu:20.04:LTS / libslirp

Package

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

Affected ranges

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

Affected versions

4.*
4.0.0-1
4.0.0-2
4.1.0-1
4.1.0-2
4.1.0-2ubuntu1
4.1.0-2ubuntu2
4.1.0-2ubuntu2.1
4.1.0-2ubuntu2.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.1.0-2ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json"

Ubuntu:22.04:LTS / libslirp

Package

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

Affected ranges

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

Affected versions

4.*
4.4.0-1build1
4.6.1-1
4.6.1-1build1
4.6.1-1ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.6.1-1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json"

Ubuntu:24.04:LTS / libslirp

Package

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

Affected ranges

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

Affected versions

4.*
4.7.0-1ubuntu1
4.7.0-1ubuntu2
4.7.0-1ubuntu3
4.7.0-1ubuntu3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.7.0-1ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json"

Ubuntu:26.10 / libslirp

Package

Name
libslirp
Purl
pkg:deb/ubuntu/libslirp?arch=source&distro=stonking

Affected ranges

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

Affected versions

4.*
4.9.1-1ubuntu1
4.9.3-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.9.3-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json"

Ubuntu:26.04:LTS / libslirp

Package

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

Affected ranges

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

Affected versions

4.*
4.8.0-1ubuntu1
4.9.1-1ubuntu1
4.9.1-1ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.9.1-1ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120830.json"