Red Hat Security Advisory: haproxy security update

{
  "id": "eca0f467941f9ad08269504a02d98b88b62febdc6b96278d665385acabc18128",
  "url": "https://osv.dev/vulnerability/RHSA-2026%3A55859",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Red Hat Security Advisory: haproxy security update",
    "summary": "Red Hat Security Advisory: haproxy security update",
    "evidence": "osv:RHSA-2026:55859",
    "products": [
      {
        "name": {
          "value": "haproxy",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:1.8.27-5.el8_10.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "haproxy-debuginfo",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:1.8.27-5.el8_10.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "haproxy-debugsource",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:1.8.27-5.el8_10.2",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RHSA-2026:55859",
      "aliases": [
        "RHSA-2026:55859"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:1.8.27-5.el8_10.2"
                }
              ]
            }
          ],
          "package": {
            "name": "haproxy",
            "purl": "pkg:rpm/redhat/haproxy",
            "ecosystem": "Red Hat:enterprise_linux:8::appstream"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:55859.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:1.8.27-5.el8_10.2"
                }
              ]
            }
          ],
          "package": {
            "name": "haproxy-debuginfo",
            "purl": "pkg:rpm/redhat/haproxy-debuginfo",
            "ecosystem": "Red Hat:enterprise_linux:8::appstream"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:55859.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:1.8.27-5.el8_10.2"
                }
              ]
            }
          ],
          "package": {
            "name": "haproxy-debugsource",
            "purl": "pkg:rpm/redhat/haproxy-debugsource",
            "ecosystem": "Red Hat:enterprise_linux:8::appstream"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:55859.json"
          }
        }
      ],
      "modified": "2026-10-16T10:20:17Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-55204"
      ],
      "references": [
        "https://access.redhat.com/errata/RHSA-2026:55859",
        "https://access.redhat.com/security/updates/classification/#important",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2490518",
        "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_55859.json",
        "https://access.redhat.com/security/cve/CVE-2026-55204",
        "https://www.cve.org/CVERecord?id=CVE-2026-55204",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55204",
        "https://github.com/haproxy/haproxy/commit/9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513",
        "https://www.vulncheck.com/advisories/haproxy-null-pointer-dereference-in-hpack-dht-insert-function"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-55204",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 339982,
  "published_at": "2026-08-18T10:21:17+00:00"
}