UBUNTU-CVE-2026-5246

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Source
https://ubuntu.com/security/CVE-2026-5246
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5246.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5246
Upstream
  • CVE-2026-5246
Published
2026-04-02T10:16:00Z
Modified
2026-06-24T11:01:50.763931747Z
Severity
  • 5.6 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 2.9 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mgtlsverifycertsignature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

References

Affected packages

Ubuntu:22.04:LTS / swupdate

Package

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

Affected ranges

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

Affected versions

2020.*
2020.11-2
2021.*
2021.04-1.1
2021.04-2
2021.04-2build1
2021.11-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2021.11-1",
            "binary_name": "libswupdate0.1"
        },
        {
            "binary_version": "2021.11-1",
            "binary_name": "lua-swupdate"
        },
        {
            "binary_version": "2021.11-1",
            "binary_name": "swupdate"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5246.json"

Ubuntu:24.04:LTS / swupdate

Package

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

Affected ranges

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

Affected versions

2023.*
2023.05+dfsg-3
2023.05+dfsg-4
2023.05+dfsg-4build1
2023.05+dfsg-5
2023.12+dfsg-1
2023.12.1+dfsg-1ubuntu1
2023.12.1+dfsg-1ubuntu4
2023.12.1+dfsg-1ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2023.12.1+dfsg-1ubuntu5",
            "binary_name": "libswupdate0.1"
        },
        {
            "binary_version": "2023.12.1+dfsg-1ubuntu5",
            "binary_name": "lua-swupdate"
        },
        {
            "binary_version": "2023.12.1+dfsg-1ubuntu5",
            "binary_name": "swupdate"
        },
        {
            "binary_version": "2023.12.1+dfsg-1ubuntu5",
            "binary_name": "swupdate-www"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5246.json"

Ubuntu:25.10 / swupdate

Package

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

Affected ranges

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

Affected versions

2024.*
2024.12.1+dfsg-1build2
2024.12.1+dfsg-2
2024.12.1+dfsg-3
2025.*
2025.05+dfsg-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2025.05+dfsg-2ubuntu1",
            "binary_name": "libswupdate0.1"
        },
        {
            "binary_version": "2025.05+dfsg-2ubuntu1",
            "binary_name": "lua-swupdate"
        },
        {
            "binary_version": "2025.05+dfsg-2ubuntu1",
            "binary_name": "swupdate"
        },
        {
            "binary_version": "2025.05+dfsg-2ubuntu1",
            "binary_name": "swupdate-www"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5246.json"

Ubuntu:26.04:LTS / swupdate

Package

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

Affected ranges

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

Affected versions

2025.*
2025.05+dfsg-2ubuntu1
2025.05+dfsg-3ubuntu1
2025.12+dfsg-1ubuntu1
2025.12+dfsg-2ubuntu1
2025.12+dfsg-3ubuntu1
2025.12+dfsg-4ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2025.12+dfsg-4ubuntu1",
            "binary_name": "libswupdate0.1"
        },
        {
            "binary_version": "2025.12+dfsg-4ubuntu1",
            "binary_name": "lua-swupdate"
        },
        {
            "binary_version": "2025.12+dfsg-4ubuntu1",
            "binary_name": "swupdate"
        },
        {
            "binary_version": "2025.12+dfsg-4ubuntu1",
            "binary_name": "swupdate-www"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5246.json"