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

{"bugzilla": {"description": "libpcap: libpcap: Information disclosure via out-of-bounds read in rpcap client", "id": "2529090", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2529090"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-125", "details": ["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.", "A flaw was found in libpcap. The rpcap client code, which processes RPCAP_MSG_PACKET messages from a server, incorrectly validates its headers. A malicious server could exploit this vulnerability by sending a specially crafted message, causing the client to read up to 20 bytes of memory beyond its intended buffer. This out-of-bounds read could lead to the disclosure of sensitive information from the client's process memory."], "name": "CVE-2026-18238", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "libpcap", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "libpcap", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "libpcap", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libpcap", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libpcap", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-05T18:51:57Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-18238\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-18238\nhttps://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473"], "threat_severity": "Moderate"}

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