CVE-2026-34956

MEDIUM

5.9

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.

CVE Details

CVSS v3.1 Score5.9

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published5/5/2026

Last Modified5/5/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-120

References

https://access.redhat.com/security/cve/CVE-2026-34956(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2453459(secalert@redhat.com)

http://www.openwall.com/lists/oss-security/2026/03/31/15(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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