EUVD-2026-72276
GHSA-q6cg-7f58-2hwm
Severity by source
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:N/VA:H/SC:H/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Local Windows service path; IDN-NRPT prerequisite warrants AC:H; low-privilege trigger; scope change (S:C) as shared service affects other users' sessions; no integrity impact from a read-only overread.
Primary rating from Vendor (CNA).
CVSS VectorVendor
Lifecycle Timeline
5Description PRE-NVD
AnalysisAI
Buffer overread in OpenVPN's Windows service component (openvpnserv) through version 2.7.6 exposes adjacent service process memory or crashes the service when NRPT domain entries containing Internationalized Domain Names (IDN) with UTF-8 encoding trigger an incorrect buffer size calculation (CWE-131). The flaw is Windows-specific and confined to split-DNS configurations that include non-ASCII domain names; Linux and macOS deployments are unaffected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following: (1) a Windows host running OpenVPN 2.7_alpha1 through 2.7.6 with the openvpnserv Windows service active; (2) a VPN configuration that includes IDN (Internationalized Domain Name) domain entries with UTF-8 encoding in the NRPT name resolution policy table; (3) local system access with at least low-privilege credentials (PR:L per CVSS 4.0). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.9 appropriately reflects moderate real-world risk constrained by the local attack vector (AV:L), high attack complexity (AC:H), attack prerequisites (AT:P - IDN domain configuration in NRPT), and low-privilege requirement (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade OpenVPN to version 2.7.7, which is the vendor-released patch for CVE-2026-78221 and four co-disclosed vulnerabilities (CVE-2026-84732, CVE-2026-84256, CVE-2026-84226, CVE-2026-82312). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-131 – Incorrect Calculation of Buffer Size
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