CVE-2026-34956

MEDIUM EPSS 32.3%

Published May 5, 20261mo ago · Modified Jun 17, 20261w ago

5.9 CVSS 3.1

Medium

Published May 5, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

Description

A flaw was found in Open vSwitch. When Open vSwitch is configured with a conntrack flow using FTP helpers over the userspace datapath, a remote attacker can send a specially crafted FTP stream with an EPASV command exceeding 255 characters. This heap access error can lead to a crash, resulting in a Denial of Service (DoS) for the affected system.

CVSS Details

Base Score

5.9

Exploitability

2.2

Impact

3.6

Vector string

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

32.3% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-120

References 3

openwall.com http://www.openwall.com/lists/oss-security/2026/03/31/15
access.redhat.com https://access.redhat.com/security/cve/CVE-2026-34956
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2453459

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.