UBUNTU-CVE-2026-5244

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Source
https://ubuntu.com/security/CVE-2026-5244
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5244.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5244
Upstream
Published
2026-04-02T08:16:00Z
Modified
2026-06-24T11:01:25.160931784Z
Severity
  • 7.3 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • 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
  • 5.5 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/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 has been found in Cesanta Mongoose up to 7.20. This affects the function mgtlsrecv_cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pubkey leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 7.21 mitigates this issue. The name of the patch is 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. It is advisable to upgrade the affected component. 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_name": "libswupdate0.1",
            "binary_version": "2021.11-1"
        },
        {
            "binary_name": "lua-swupdate",
            "binary_version": "2021.11-1"
        },
        {
            "binary_name": "swupdate",
            "binary_version": "2021.11-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5244.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_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",
            "binary_version": "2023.12.1+dfsg-1ubuntu5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5244.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_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",
            "binary_version": "2025.05+dfsg-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5244.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_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",
            "binary_version": "2025.12+dfsg-4ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5244.json"