{"id":"CVE-2026-115449","aliases":["AZL-111020","DEBIAN-CVE-2026-115449","EUVD-2026-108518","GHSA-pg96-xmqg-mmpv","UBUNTU-CVE-2026-115449"],"status":"published","title":"Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest","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.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00239,"percentile":0.1515,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2026-10-22T21:20:56Z","modified":"2026-11-07T14:17:52Z","fixes":[{"ecosystem":"Azure Linux:3","package":"libslirp","fixed_in":["4.9.6-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9.6-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-1","4.8.0-1","4.9.1-1","4.9.2-1","4.9.3-1","4.9.4-1","4.9.5-1"]},{"source":"osv","ecosystem":"Debian:13","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-1","4.8.0-1+deb13u1","4.9.1-1","4.9.2-1","4.9.3-1","4.9.4-1","4.9.5-1"]},{"source":"osv","ecosystem":"Debian:14","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-1","4.9.1-1","4.9.2-1","4.9.3-1","4.9.4-1","4.9.5-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1","4.0.0-2","4.1.0-1","4.1.0-2","4.1.0-2ubuntu1","4.1.0-2ubuntu2","4.1.0-2ubuntu2.1","4.1.0-2ubuntu2.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.0-1build1","4.6.1-1","4.6.1-1build1","4.6.1-1ubuntu0.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-1ubuntu1","4.7.0-1ubuntu2","4.7.0-1ubuntu3","4.7.0-1ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.1-1ubuntu1","4.9.3-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-1ubuntu1","4.9.1-1ubuntu1","4.9.1-1ubuntu1.1"]}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat openshift container platform 4"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-115449","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2558916","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115449","tags":["web"]},{"url":"https://github.com/advisories/GHSA-pg96-xmqg-mmpv"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-115449","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-115449","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-115449","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-115449","title":"Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest","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.","status":"published","published":"2026-10-22T21:20:56.855Z","modified":"2026-11-06T17:51:03.27Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-06T18:59:07.714367Z"}],"euvd":[{"id":"EUVD-2026-108518","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.","status":"published","published":"2026-10-22T21:20:56Z","modified":"2026-11-06T17:51:03Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-06T19:05:53.354277Z"}],"ghsa":[{"id":"GHSA-pg96-xmqg-mmpv","title":"A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated...","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.","status":"published","published":"2026-10-23T00:33:11Z","modified":"2026-10-23T00:33:12Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:14:18.215402Z"}],"nvd":[{"id":"CVE-2026-115449","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.","status":"published","published":"2026-10-22T22:18:06.647Z","modified":"2026-11-06T18:17:55.803Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-200"],"updated_at":"2026-11-06T20:01:14.854606Z"}],"osv":[{"id":"DEBIAN-CVE-2026-115449","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.","status":"published","published":"2026-10-22T22:18:06.647Z","modified":"2026-11-07T09:47:27.747454269Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-07T10:14:39.995311Z"},{"id":"UBUNTU-CVE-2026-115449","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.","status":"published","published":"2026-10-22T22:18:00Z","modified":"2026-10-28T17:50:38Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T16:56:00.081948Z"},{"id":"AZL-111020","title":"CVE-2026-115449 affecting package libslirp for versions less than 4.9.6-1","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.","status":"published","published":"2026-10-22T22:18:06Z","modified":"2026-11-07T14:17:52.957285971Z","updated_at":"2026-11-07T14:48:11.583685Z"}]}}