UBUNTU-CVE-2026-38821

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Source
https://ubuntu.com/security/CVE-2026-38821
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-38821.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-38821
Upstream
Published
2026-08-31T00:00:00Z
Modified
2026-08-31T22:15:16.823654439Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A heap-based buffer overflow vulnerability exists in openNDS before 11.0.0 that allows an unauthenticated attacker on the captive portal network to crash the openNDS daemon (denial of service) and potentially achieve remote code execution. This is in http_microhttpd.c.

References

Affected packages

Ubuntu:Pro:24.04:LTS / opennds

Package

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

Affected ranges

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

Affected versions

9.*
9.10.0-1
10.*
10.2.0+dfsg-1
10.2.0+dfsg-1build1
10.2.0+dfsg-1build2
10.2.0+dfsg-1ubuntu0.24.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "10.2.0+dfsg-1ubuntu0.24.04.1~esm1",
            "binary_name": "opennds"
        },
        {
            "binary_version": "10.2.0+dfsg-1ubuntu0.24.04.1~esm1",
            "binary_name": "opennds-daemon"
        },
        {
            "binary_version": "10.2.0+dfsg-1ubuntu0.24.04.1~esm1",
            "binary_name": "opennds-daemon-common"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-38821.json"

Ubuntu:26.04:LTS / opennds

Package

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

Affected ranges

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

Affected versions

10.*
10.3.1+dfsg-1
10.3.1+dfsg-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "10.3.1+dfsg-1build1",
            "binary_name": "opennds"
        },
        {
            "binary_version": "10.3.1+dfsg-1build1",
            "binary_name": "opennds-daemon"
        },
        {
            "binary_version": "10.3.1+dfsg-1build1",
            "binary_name": "opennds-daemon-common"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-38821.json"