{"id":"CVE-2026-18238","state":"PUBLISHED","title":"OOBR in rpcap client in libpcap before 1.10.7","description":"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 memory beyond the end of the buffer as if it was a part of the captured packet.","publishedAt":"2026-09-05T18:51:57.956Z","updatedAt":"2026-09-08T15:17:19.641Z","severity":{"score":5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","source":"Tcpdump"},"assigner":"Tcpdump","products":["The Tcpdump Group libpcap"],"affected":[{"vendor":"The Tcpdump Group","product":"libpcap","defaultStatus":"unaffected","versions":[{"version":"1.8.x","status":"affected"},{"version":"1.9.x","status":"affected"},{"version":"1.10.x","status":"affected","lessThan":"1.10.7","versionType":"semver"}],"modules":["remote packet capture client"],"programFiles":["pcap-rpcap.c"],"programRoutines":[{"name":"pcap_read_nocb_remote()"}],"repo":"https://github.com/the-tcpdump-group/libpcap/"}],"references":["https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473"],"weaknesses":["CWE-1288","CWE-126"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/18xxx/CVE-2026-18238.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18238","state":"PUBLISHED","datePublished":"2026-09-05T18:51:57.956Z","dateUpdated":"2026-09-08T15:17:19.641Z","assignerShortName":"Tcpdump","assignerOrgId":"cfdbb673-b408-4d03-89c1-c3d73ed80896","dateReserved":"2026-07-29T13:32:44.322Z"},"containers":{"cna":{"title":"OOBR in rpcap client in libpcap before 1.10.7","descriptions":[{"lang":"en","value":"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 memory beyond the end of the buffer as if it was a part of the captured packet."}],"affected":[{"vendor":"The Tcpdump Group","product":"libpcap","defaultStatus":"unaffected","versions":[{"version":"1.8.x","status":"affected"},{"version":"1.9.x","status":"affected"},{"version":"1.10.x","status":"affected","lessThan":"1.10.7","versionType":"semver"}],"modules":["remote packet capture client"],"programFiles":["pcap-rpcap.c"],"programRoutines":[{"name":"pcap_read_nocb_remote()"}],"repo":"https://github.com/the-tcpdump-group/libpcap/"}],"references":[{"url":"https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473","tags":["patch"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1288","description":"CWE-1288: Improper Validation of Consistency within Input","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-126","description":"CWE-126 Buffer Over-read","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Tcpdump","orgId":"cfdbb673-b408-4d03-89c1-c3d73ed80896","dateUpdated":"2026-09-05T18:51:57.956Z"},"configurations":[{"lang":"en","value":"The problem is specific to the remote packet capture code, which is not enabled in the default build configuration."}],"exploits":[{"lang":"en","value":"A functional exploit exists."}],"solutions":[{"lang":"en","value":"Upgrade to libpcap 1.10.7."}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-08T15:17:08.655802Z","id":"CVE-2026-18238","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-08T15:17:19.641Z"}}]}}}