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.
History

Fri, 23 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 23 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-200
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N'}

threat_severity

Low


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-22T21:20:56.855Z

Updated: 2026-10-23T15:00:22.267Z

Reserved: 2026-10-22T14:40:34.103Z

Link: CVE-2026-115449

cve-icon Vulnrichment

Updated: 2026-10-23T14:48:37.712Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-22T22:18:06.647

Modified: 2026-10-23T16:44:17.950

Link: CVE-2026-115449

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-22T00:00:00Z

Links: CVE-2026-115449 - Bugzilla