Bug 2509668 - CVE-2026-11771 openvpn: OpenVPN: Denial of Service via crafted NTLM proxy response [fedora-all]
Summary: CVE-2026-11771 openvpn: OpenVPN: Denial of Service via crafted NTLM proxy res...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: openvpn
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Frank Lichtenheld
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["c4ca155e-a355-4e49-bd35-3...
Depends On:
Blocks: CVE-2026-11771
TreeView+ depends on / blocked
 
Reported: 2026-07-31 04:21 UTC by Srikanth Balasubramanian
Modified: 2026-08-03 11:23 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-08-03 11:23:57 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Srikanth Balasubramanian 2026-07-31 04:21:53 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server
Comment 1 Frank Lichtenheld 2026-08-03 11:23:57 UTC 
2.6.21 has been published to Fedora 43. 2.7.5 has been published to Fedora 44 and Rawhide
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