{"cve":"CVE-2026-4748","nvd":{"published":"2026-04-01T07:16:02.447","modified":"2026-06-17T10:57:10.143","status":"Analyzed","description":"A regression in the way hashes were calculated caused rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address range(s) involved to be silently dropped as duplicates.  Only the first of such rules is actually loaded into pf.  Ranges expressed using the address[/mask-bits] syntax were not affected.\n\nSome keywords representing actions taken on a packet-matching rule, such as 'log', 'return tll', or 'dnpipe', may suffer from the same issue.  It is unlikely that users have such configurations, as these rules would always be redundant.\n\nAffected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-480","CWE-754","CWE-1023"],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:09.pf.asc"],"products":["freebsd:freebsd"],"source":"nvd","synced_at":"2026-10-19T22:28:18.033120106+00:00"},"epss":{"cve":"CVE-2026-4748","score":0.00254,"percentile":0.17085,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}