{"id":"CVE-2026-120830","aliases":["AZL-112679","DEBIAN-CVE-2026-120830","EUVD-2026-115651","GHSA-r5f9-pc8m-f599","UBUNTU-CVE-2026-120830"],"status":"published","title":"Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00221,"percentile":0.12847,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-11-03T00:00:35Z","modified":"2026-11-05T14:17:04Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"libslirp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"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"},{"vendor":"red hat","product":"red hat openshift container platform 5"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-120830","tags":["vdb-entry","x_refsource_REDHAT","advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2565424","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/commit/21b33a6c5588af9f58d15e528fdc1019452708e4","tags":["fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120830","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-r5f9-pc8m-f599"},{"url":"https://access.redhat.com/downloads/content/package-browser/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120830.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-120830","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-120830","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-120830","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-120830","title":"Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:00:35.813Z","modified":"2026-11-09T14:28:13.987Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-09T15:33:44.265689Z"}],"euvd":[{"id":"EUVD-2026-115651","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:00:35Z","modified":"2026-11-09T14:28:13Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-09T15:17:13.549805Z"}],"ghsa":[{"id":"GHSA-r5f9-pc8m-f599","title":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the...","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:31:24Z","modified":"2026-11-03T00:31:29Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-03T00:53:57.407227Z"}],"nvd":[{"id":"CVE-2026-120830","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:17:18.947Z","modified":"2026-11-09T15:17:08.67Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-09T18:15:13.699929Z"}],"osv":[{"id":"CVE-2026-120830","title":"Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:00:35.813Z","modified":"2026-11-11T07:19:59.171851999Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-10T03:16:41.950556Z"},{"id":"DEBIAN-CVE-2026-120830","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:17:18.947Z","modified":"2026-11-10T09:47:41.303250703Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-10T10:26:30.347596Z"},{"id":"UBUNTU-CVE-2026-120830","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:17:00Z","modified":"2026-11-05T04:42:52Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-05T13:33:25.727744Z"},{"id":"AZL-112679","title":"CVE-2026-120830 affecting package libslirp 4.9.6-1","description":"A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.","status":"published","published":"2026-11-03T00:17:18Z","modified":"2026-11-05T14:17:04.865273913Z","updated_at":"2026-11-05T16:41:19.001909Z"}]}}