Vulnerability 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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-34956
- https://bugzilla.redhat.com/show_bug.cgi?id=2453459
- http://www.openwall.com/lists/oss-security/2026/03/31/15
FAQ
What is CVE-2026-34956?
CVE-2026-34956 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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...
How severe is CVE-2026-34956?
CVE-2026-34956 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34956?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.