{"schema_version": "1.7.0", "id": "RLSA-2026:19158", "modified": "2026-05-29T16:04:54.183666Z", "published": "2026-05-29T16:03:24.060458Z", "upstream": ["CVE-2026-2291", "CVE-2026-4890", "CVE-2026-4891", "CVE-2026-4892", "CVE-2026-4893", "CVE-2026-5172"], "summary": "Important: dnsmasq security update", "details": "The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.\n\nSecurity Fix(es):\n\n* dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291)\n\n* dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890)\n\n* dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891)\n\n* dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892)\n\n* dnsmasq: Broken ECS source validation bypass (CVE-2026-4893)\n\n* dnsmasq: extract_addresses() OOB read via malformed rdlen (CVE-2026-5172)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "severity": [{"type": "CVSS_V3", "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}], "affected": [{"package": {"ecosystem": "Rocky Linux:10", "name": "dnsmasq", "purl": "pkg:rpm/rocky-linux/dnsmasq?distro=rocky-linux-10&epoch=0"}, "ranges": [{"type": "ECOSYSTEM", "events": [{"introduced": "0"}, {"fixed": "0:2.90-7.el10_2"}], "database_specific": {"yum_repository": "AppStream"}}]}], "references": [{"type": "ADVISORY", "url": "https://errata.rockylinux.org/RLSA-2026:19158"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458517"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439088"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458521"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458516"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458519"}, {"type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458518"}], "credits": [{"name": "Rocky Enterprise Software Foundation"}, {"name": "Red Hat"}]}