UBUNTU-CVE-2026-28525

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Source
https://ubuntu.com/security/CVE-2026-28525
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28525.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-28525
Upstream
Published
2026-04-23T21:16:00Z
Modified
2026-05-27T19:15:14Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H CVSS Calculator
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.

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
0 Unknown 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-2026-28525.json"

Ubuntu:24.04:LTS / swupdate

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-28525.json"

Ubuntu:25.10 / swupdate

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-28525.json"

Ubuntu:26.04:LTS / swupdate

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-28525.json"