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OpenAdvisories
High RHSA-2026:55802 2 CVEs

Red Hat Security Advisory: haproxy security update

Published Aug 18, 2026 · Updated Oct 16, 2026

Ecosystem: Red Hat

Fixed packages 3

ReleasePackageFixed in
Red Hat · RHEL 9.2 E4S rhel_e4s:9.2::appstream haproxy 0:2.4.17-6.el9_2.5
Red Hat · RHEL 9.2 E4S rhel_e4s:9.2::appstream haproxy-debuginfo 0:2.4.17-6.el9_2.5
Red Hat · RHEL 9.2 E4S rhel_e4s:9.2::appstream haproxy-debugsource 0:2.4.17-6.el9_2.5

Vulnerabilities 2

  • High 7.5
    CVE-2026-55203

    HAProxy - Integer Overflow in FCGI Demux Record Length Field

    HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer misparse as new FCGI record headers. When contentLength is 65535 and paddingLength is 1 or more, the drl field…

    HAProxy HAProxy haproxy haproxy Debian Ubuntu Azure Linux Wolfi
  • 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
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2490522
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_55802.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-55203
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-55203
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-55203
  • article
    https://github.com/haproxy/haproxy/commit/5985276735777634d8c85f1d73bb7764aab0d6dd
  • article
    https://www.vulncheck.com/advisories/haproxy-integer-overflow-in-fcgi-demux-record-length-field
  • 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