{"id":"CVE-2026-18238","title":"The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers","summary":"The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers.  A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process…","severity":"medium","cvss":5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","cwe":["CWE-126","CWE-1288","CWE-125"],"vendor":"The Tcpdump Group","product":"libpcap","affected":["libpcap 1.8.x","libpcap 1.9.x","libpcap >= 1.10.x < 1.10.7"],"published":"2026-09-05","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:20:25.117","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18238","references":[{"url":"https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473","label":"security@tcpdump.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18238.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-18238"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529090"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18238"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18238"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00176,"epssPercentile":0.07431,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T15:17:08.655802Z"},"ingestedAt":"2026-09-06T10:53:52.033Z","slug":"CVE-2026-18238","body":"## Overview\n\nThe rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers.  A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18238.json)","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}