CVE-2026-18238

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18238", "assignerOrgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896", "state": "PUBLISHED", "assignerShortName": "Tcpdump", "dateReserved": "2026-07-29T13:32:44.322Z", "datePublished": "2026-09-05T18:51:57.956Z", "dateUpdated": "2026-09-08T15:17:19.641Z"}, "containers": {"cna": {"affected": [{"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"}]}], "configurations": [{"lang": "en", "value": "The problem is specific to the remote packet capture code, which is not enabled in the default build configuration."}], "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."}], "exploits": [{"lang": "en", "value": "A functional exploit exists."}], "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": {"orgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896", "shortName": "Tcpdump", "dateUpdated": "2026-09-05T18:51:57.956Z"}, "references": [{"tags": ["patch"], "url": "https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473"}], "solutions": [{"lang": "en", "value": "Upgrade to libpcap 1.10.7."}], "source": {"discovery": "EXTERNAL"}, "title": "OOBR in rpcap client in libpcap before 1.10.7", "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T15:17:19.641Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-18238", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T15:17:08.655802Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T15:17:13.582Z"}}], "cna": {"title": "OOBR in rpcap client in libpcap before 1.10.7", "source": {"discovery": "EXTERNAL"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 5, "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"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"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()"}]}], "exploits": [{"lang": "en", "value": "A functional exploit exists."}], "solutions": [{"lang": "en", "value": "Upgrade to libpcap 1.10.7."}], "references": [{"url": "https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473", "tags": ["patch"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1288", "description": "CWE-1288: Improper Validation of Consistency within Input"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-126", "description": "CWE-126 Buffer Over-read"}]}], "configurations": [{"lang": "en", "value": "The problem is specific to the remote packet capture code, which is not enabled in the default build configuration."}], "providerMetadata": {"orgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896", "shortName": "Tcpdump", "dateUpdated": "2026-09-05T18:51:57.956Z"}}}, "cveMetadata": {"cveId": "CVE-2026-18238", "state": "PUBLISHED", "dateUpdated": "2026-09-08T15:17:19.641Z", "dateReserved": "2026-07-29T13:32:44.322Z", "assignerOrgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896", "datePublished": "2026-09-05T18:51:57.956Z", "assignerShortName": "Tcpdump"}, "dataVersion": "5.2"}

{"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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.8.0,1.9.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.9.0,2.0.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.10.0,1.10.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "libpcap", "source": "cna", "vendor": "The Tcpdump Group"}, "product": "libpcap", "vendor": "tcpdump"}], "created": "2026-09-05T21:00:05.102054+00:00", "updated": "2026-09-10T04:45:16.129476+00:00", "vendors": ["tcpdump", "tcpdump$PRODUCT$libpcap"]}