High [CVE-2026-84732] Remote Denial of Service via crafted ACK packets
This high-severity Red Hat Linux advisory covers CVE-2026-84732.
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Summary
A flaw was found in OpenVPN. Remote unauthenticated attackers can cause a denial of service by sending specially crafted network inputs.
These inputs trigger a timeout integer overflow during the retransmission of acknowledgment (ACK) packet IDs, which can make the OpenVPN service unavailable. This is an Important denial of service flaw in OpenVPN, enabling remote unauthenticated attackers to disrupt service availability.
The vulnerability, stemming from crafted ACK packet retransmissions, can render OpenVPN instances unresponsive when exposed to untrusted networks, posing a significant risk to VPN service continuity. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-190.
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 9 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 9 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 9 hours ago·verify at source
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