CVE-2026-18238

{"id": "CVE-2026-18238", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18238", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T15:17:08.655802Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@tcpdump.org", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.0, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.1}]}, "affected": [{"source": "security@tcpdump.org", "affectedData": [{"repo": "https://github.com/the-tcpdump-group/libpcap/", "vendor": "The Tcpdump Group", "modules": ["remote packet capture client"], "product": "libpcap", "versions": [{"status": "affected", "version": "1.8.x"}, {"status": "affected", "version": "1.9.x"}, {"status": "affected", "version": "1.10.x", "lessThan": "1.10.7", "versionType": "semver"}], "programFiles": ["pcap-rpcap.c"], "defaultStatus": "unaffected", "programRoutines": [{"name": "pcap_read_nocb_remote()"}]}]}], "published": "2026-09-05T19:16:55.477", "references": [{"url": "https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473", "source": "security@tcpdump.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security@tcpdump.org", "description": [{"lang": "en", "value": "CWE-126"}, {"lang": "en", "value": "CWE-1288"}]}], "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."}], "lastModified": "2026-09-08T19:20:25.117", "sourceIdentifier": "security@tcpdump.org"}