Published Oct 22, 2026Sources checked Oct 28, 2026
3.5LOWCVSS out of 10
What this means
Review the available evidence
CVE-2026-115449 and is rated Low severity with a CVSS score of 3.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Oct 28, 2026
Release Notes
Vendor-listed releases
4.9.6-1
CISA KEVNot listedBased on the latest collected catalog
EPSS0.2%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-115449?
A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated to match the actual data received from the host.
Under specific conditions where the normal ICMP socket is unavailable, this length mismatch causes the host's real IP address to be leaked to the guest in the echo reply, breaking the NAT isolation that user-mode networking is expected to provide.