Out-of-bounds read in Open Virtual Network - CVE-2026-5265
Published: April 20, 2026
Vulnerability identifier: #VU126563
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5265
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Open Virtual Network
Affected software:
Open Virtual Network
Open Virtual Network
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the pinctrl ICMP error response handler when generating ICMP Destination Unreachable or Packet Too Big responses from crafted IP packets with inflated length fields. A remote attacker can send a specially crafted packet to disclose sensitive information.
Exploitation requires triggering an ICMP error path, such as reject ACL handling, gateway MTU checks, or a load balancer configured to reject traffic when no backends are available.
How to mitigate CVE-2026-5265
Install security update from vendor's website.