CVE-2026-115449

Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest

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

Red Hat · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 8 · Red Hat Enterprise Linux 9 · Red Hat OpenShift Container Platform 4

CVSS v3.1 REDHAT

3.5 LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

EPSS

0.24% chance of exploitation in the next 30 days, 15th percentile

Published

2026-10-22

Updated

2026-10-23

Proof-of-concept exploits (1)

• ManifoldOps/manifold-operationsRepo stars 0★ · pushed 2026-10-24 · snapshot
  4 files

  contributions.htmlcve-2026-115449.htmlindex.htmlprojects.html

CVE references

• https://access.redhat.com/security/cve/CVE-2026-115449REFERENCE
• https://bugzilla.redhat.com/show_bug.cgi?id=2558916REFERENCE

References

• CVE Record
• NVD entry