Buffer overflow in Red Hat Fast Datapath For Rhel 7
CVE-2026-34956
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…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (31.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- RHBZ#2453459 (x_refsource_REDHAT, issue-tracking)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-34956?
- CVE-2026-34956 is a medium-severity vulnerability in Red Hat Fast Datapath For Rhel 7, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2026-05-05.
- How severe is CVE-2026-34956?
- Medium severity. CVSS v3 base score is 5.9 out of 10.