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OpenAdvisories
High RHSA-2026:55862 1 CVE

Red Hat Security Advisory: haproxy security update

Published Aug 18, 2026 · Updated Oct 16, 2026

Ecosystem: Red Hat

Fixed packages 6

ReleasePackageFixed in
Red Hat · RHEL 8.6 AUS rhel_aus:8.6::appstream haproxy 0:1.8.27-4.el8_6.2
Red Hat · RHEL 8.6 AUS rhel_aus:8.6::appstream haproxy-debuginfo 0:1.8.27-4.el8_6.2
Red Hat · RHEL 8.6 AUS rhel_aus:8.6::appstream haproxy-debugsource 0:1.8.27-4.el8_6.2
Red Hat · RHEL 8.6 EUS Long Life rhel_eus_long_life:8.6::appstream haproxy 0:1.8.27-4.el8_6.2
Red Hat · RHEL 8.6 EUS Long Life rhel_eus_long_life:8.6::appstream haproxy-debuginfo 0:1.8.27-4.el8_6.2
Red Hat · RHEL 8.6 EUS Long Life rhel_eus_long_life:8.6::appstream haproxy-debugsource 0:1.8.27-4.el8_6.2

Vulnerabilities 1

  • High 7.5
    CVE-2026-55204

    HAProxy - NULL Pointer Dereference in hpack_dht_insert Function

    HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that fails to validate the return value of hpack_dht_defrag() when the memory pool is exhausted. An attacker can tri…

    HAProxy HAProxy haproxy haproxy Debian Ubuntu Azure Linux Wolfi

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2490518
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_55862.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-55204
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-55204
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-55204
  • article
    https://github.com/haproxy/haproxy/commit/9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513
  • article
    https://www.vulncheck.com/advisories/haproxy-null-pointer-dereference-in-hpack-dht-insert-function