Bug 2509669

Summary:	CVE-2026-11771 openvpn: OpenVPN: Denial of Service via crafted NTLM proxy response [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Srikanth Balasubramanian <sbalasub>
Component:	openvpn	Assignee:	Frank Lichtenheld <frank>
Status:	ASSIGNED ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	epel10	CC:	dazo, frank, huzaifas, kalevlember, steve
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["c4ca155e-a355-4e49-bd35-351efb37ed3c"]}
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Doc Text:		Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2509516

Description Srikanth Balasubramanian 2026-07-31 04:21:57 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 11:30:47 UTC

2.7.5 has been published to EPEL 10. No fixes for EPEL 8 or 9 have been published so far.