High [CVE-2026-78221] Memory corruption and information disclosure vulnerability
This high-severity Red Hat Linux advisory covers CVE-2026-78221.
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Summary
A flaw was found in OpenVPN. An incorrect buffer size calculation within the Windows Interactive Service allows local authenticated users to trigger memory corruption or disclose sensitive information.
This vulnerability can be exploited by providing specially crafted inputs. Red Hat's OpenVPN packages, available in Community Projects like Fedora and EPEL, are Linux-based and do not include the vulnerable Windows-specific service, thus are not directly impacted by this flaw.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:H). Weakness: CWE-120.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
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