{"id":"CVE-2026-95508","aliases":["AZL-103472","DEBIAN-CVE-2026-95508","EUVD-2026-84336","GHSA-3qjr-gg7g-qcrr","UBUNTU-CVE-2026-95508"],"status":"published","title":"Libslirp: libslirp: heap buffer overflow in dhcpv6/tftp response builders on small interface mtu","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0057,"percentile":0.47473,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2026-09-22T08:36:01Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Debian:14","package":"libslirp","fixed_in":["4.9.5-1"],"sources":["osv"]}],"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"},{"fixed":"4.9.5-1"}]}],"versions":["4.8.0-1","4.9.1-1","4.9.2-1","4.9.3-1","4.9.4-1"]},{"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-2026-95508","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2537748","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95508","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3qjr-gg7g-qcrr"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-95508","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-95508","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-95508","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-95508","title":"Libslirp: libslirp: heap buffer overflow in dhcpv6/tftp response builders on small interface mtu","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T08:36:01.598Z","modified":"2026-11-06T02:13:55.014Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T03:26:01.286096Z"}],"euvd":[{"id":"EUVD-2026-84336","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T08:36:01Z","modified":"2026-11-06T02:13:55Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-06T03:02:58.554056Z"}],"ghsa":[{"id":"GHSA-3qjr-gg7g-qcrr","title":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When...","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T09:31:13Z","modified":"2026-09-22T09:31:17Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:12:16.582397Z"}],"nvd":[{"id":"CVE-2026-95508","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T09:17:06.073Z","modified":"2026-11-06T03:16:46.37Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-06T06:59:05.647867Z"}],"osv":[{"id":"DEBIAN-CVE-2026-95508","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T09:17:06.073Z","modified":"2026-11-03T09:47:29.449032956Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T10:27:58.933618Z"},{"id":"UBUNTU-CVE-2026-95508","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T09:17:00Z","modified":"2026-10-22T23:20:38.069728185Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"AZL-103472","title":"CVE-2026-95508 affecting package libslirp 4.9.6-1","description":"A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.","status":"published","published":"2026-09-22T09:17:06Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:17.528763Z"}]}}