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Vulnerability · Published Oct 22, 2026 · Assigned by redhat

CVE-2026-115449Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest

Low 3.5

In plain English

A low-severity information exposure in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)3.5Low
Exploit odds (30 days)0.2%top 84.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libslirpno fix listedDEBIAN-CVE-2026-115449
Debian:13libslirpno fix listedDEBIAN-CVE-2026-115449
Debian:14libslirpno fix listedDEBIAN-CVE-2026-115449
Ubuntu:22.04:LTSlibslirpno fix listedUBUNTU-CVE-2026-115449
Ubuntu:24.04:LTSlibslirpno fix listedUBUNTU-CVE-2026-115449
Ubuntu:26.04:LTSlibslirpno fix listedUBUNTU-CVE-2026-115449
Ubuntu:26.10libslirpno fix listedUBUNTU-CVE-2026-115449

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

References