CVE-2026-34956
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 3.7.1-1 |
| debian | sid | fixed | 3.7.1-1 |
| debian | trixie | affected | |
| windows | affected | |
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
- https://www.suse.com/security/cve/CVE-2026-34956.html
- https://security-tracker.debian.org/tracker/CVE-2026-34956
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34956
CWEs
CWE-120
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.