{"id":"CVE-2026-6554","summary":"infinte loop in libpcap before 1.10.7","details":"libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations.  A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.","modified":"2026-10-28T11:01:21.602318801Z","published":"2026-09-05T18:51:02.338Z","related":["SUSE-SU-2026:23737-1","SUSE-SU-2026:23829-1","SUSE-SU-2026:23892-1","SUSE-SU-2026:23907-1","SUSE-SU-2026:4188-1","SUSE-SU-2026:4194-1","SUSE-SU-2026:4195-1","SUSE-SU-2026:4239-1","openSUSE-SU-2026:11744-1","openSUSE-SU-2026:21940-1"],"database_specific":{"cwe_ids":["CWE-835"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6554.json","cna_assigner":"Tcpdump"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/10/22/3"},{"type":"WEB","url":"https://github.com/the-tcpdump-group/libpcap/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6554.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6554"},{"type":"FIX","url":"https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/the-tcpdump-group/libpcap","events":[{"introduced":"0"},{"fixed":"1926f4163e4eef978c71fde28a3f6d51fff183a8"},{"fixed":"ff3c83475ac303c6b681c52ad0b6e14795a8e0ce"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"0"},{"fixed":"1.10.7"}],"source":"AFFECTED_FIELD"},{"range":[{"fixed":"ff3c83475ac303c6b681c52ad0b6e14795a8e0ce"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["libpcap-1.10.6","libpcap-1.10.5","libpcap-1.10.4","libpcap-1.10.3","libpcap-1.10.2","libpcap-1.10.1","libpcap-1.10.0","libpcap-1.10-bp","libpcap-1.9-bp","libpcap-1.9.0-rc1","libpcap-1.8.1","libpcap-1.8.0-bp","libpcap-1.7.0-bp","libpcap-0.8-bp","libpcap-0.7.1","libpcap-0.6.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6554.json","vanir_signatures":[{"signature_type":"Function","signature_version":"v1","source":"https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce","target":{"file":"bpf_filter.c","function":"pcapint_validate_filter"},"deprecated":false,"digest":{"length":1436,"function_hash":"176251572843044530277624267713980694612"},"id":"CVE-2026-6554-697a4abe"},{"source":"https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce","target":{"file":"bpf_filter.c"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["260368575878382541624670762537255236354","270302858585418669486197623206375452003","319084393174427731991634934320312903128","201636556515746756313257798867805842450","18381590733007613273981415303643613479","283799456181508361809190560147858478812","195412407350984622946698686548069717713","193595949453106055179176065392579107421","112116824152779515061715563043132481161","205856890806059150342612842144881273003","155923389134453085717980298750509394391","291766890536457417112182997295068003799","263682808840101929936751009523121514003","113396661104202056140385670359028627634","177031913021320221985709304935068917325"]},"id":"CVE-2026-6554-bedb3f50","signature_type":"Line","signature_version":"v1"}],"vanir_signatures_modified":"2026-10-28T11:01:21Z"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}