{"id":"RHSA-2026:55861","summary":"Red Hat Security Advisory: haproxy security update","modified":"2026-08-18T10:34:13.129972166Z","published":"2026-08-18T10:21:17Z","upstream":["CVE-2026-55204"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:55861"},{"type":"ARTICLE","url":"https://access.redhat.com/security/updates/classification/#important"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2490518"},{"type":"ADVISORY","url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_55861.json"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-55204"},{"type":"ADVISORY","url":"https://www.cve.org/CVERecord?id=CVE-2026-55204"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55204"},{"type":"ARTICLE","url":"https://github.com/haproxy/haproxy/commit/9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513"},{"type":"ARTICLE","url":"https://www.vulncheck.com/advisories/haproxy-null-pointer-dereference-in-hpack-dht-insert-function"}],"affected":[{"package":{"name":"haproxy","ecosystem":"Red Hat:rhel_aus:8.4::appstream","purl":"pkg:rpm/redhat/haproxy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.8.27-2.el8_4.2"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:55861.json"}},{"package":{"name":"haproxy-debuginfo","ecosystem":"Red Hat:rhel_aus:8.4::appstream","purl":"pkg:rpm/redhat/haproxy-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.8.27-2.el8_4.2"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:55861.json"}},{"package":{"name":"haproxy-debugsource","ecosystem":"Red Hat:rhel_aus:8.4::appstream","purl":"pkg:rpm/redhat/haproxy-debugsource"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.8.27-2.el8_4.2"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:55861.json"}},{"package":{"name":"haproxy","ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","purl":"pkg:rpm/redhat/haproxy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.8.27-2.el8_4.2"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:55861.json"}},{"package":{"name":"haproxy-debuginfo","ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","purl":"pkg:rpm/redhat/haproxy-debuginfo"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.8.27-2.el8_4.2"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:55861.json"}},{"package":{"name":"haproxy-debugsource","ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","purl":"pkg:rpm/redhat/haproxy-debugsource"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.8.27-2.el8_4.2"}]}],"database_specific":{"source":"https://security.access.redhat.com/data/osv/RHSA-2026:55861.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}