Vulnerability DatabaseCVE-2026-38821
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CVE-2026-38821
Published:August 28, 2026
Updated:September 24, 2026
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.
Affected Packages
https://github.com/openNDS/openNDS.git (GITHUB):
Affected version(s) >=v5.0.0 <v11.0.0
Fix Suggestion:
Update to version v11.0.0
Related Resources (3)
https://nvd.nist.gov/vuln/detail/CVE-2026-38821
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/38xxx/CVE-2026-38821.json
https://github.com/openNDS/openNDS/commit/3b5f7ef40cd048826d3c4a16f61a73a1768fd5a9
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CVSS v4
Base Score:
7.6
Attack Vector
ADJACENT
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.1
Attack Vector
ADJACENT
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Heap-based Buffer Overflow
CWE-122
EPSS
Base Score:
0.20