Medium [CVE-2026-81738] Out-of-bounds write via crafted DOMAIN-SEARCH entries
This medium-severity Red Hat Linux advisory covers CVE-2026-81738.
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Summary
A flaw was found in OpenVPN when using the tap-windows6 driver. A remote attacker could exploit this vulnerability by sending specially crafted DOMAIN-SEARCH entries.
This could lead to an out-of-bounds write, potentially causing information disclosure or a denial of service. Red Hat products are not directly impacted as they do not deploy OpenVPN with this specific Windows driver.
Red Hat severity: Low — CVSS 4.2 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L). Weakness: CWE-787.
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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