Buffer Overflow Affecting openvswitch package, versions [2.8.0,3.3.9)[3.4.0,3.4.6)[3.5.0,3.5.4)[3.6.0,3.6.3)[3.7.0,3.7.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-OPENVSWITCH-16424129
- published6 May 2026
- disclosed31 Mar 2026
- creditSeiji Sakurai
Introduced: 31 Mar 2026
CVE-2026-34956 (opens in a new tab)How to fix?
Upgrade openvswitch to version 3.3.9, 3.4.6, 3.5.4, 3.6.3, 3.7.1 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Overflow via the FTP helpers process when configured over the userspace datapath. An attacker can cause a crash and disrupt service availability by sending a specially crafted FTP stream containing an EPASV command exceeding 255 characters. This is only exploitable if the system is specifically configured with FTP helpers over the userspace datapath, which is not enabled by default.
Workaround
This vulnerability can be mitigated by avoiding the use of alg=ftp flows.