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CVE-2026-55203

🗓️ 18 Jun 2026 16:05:20Reported by VulnCheckType 
cve
 cve
🔗 web.nvd.nist.gov👁 51 Views

HAProxy before 3.4.0 has a fastcgi demux record length overflow that desynchronizes the parser and risks routing or memory safety issues.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-55203
18 Jun 202616:05
attackerkb
AlpineLinux
CVE-2026-55203
18 Jun 202616:05
alpinelinux
CBLMariner
CVE-2026-55203 affecting package haproxy for versions less than 2.9.11-7
1 Jul 202602:06
cbl_mariner
Chainguard
CVE-2026-55203 vulnerabilities
7 Jul 202614:17
cgr
Circl
CVE-2026-55203
18 Jun 202617:28
circl
Cvelist
CVE-2026-55203 HAProxy - Integer Overflow in FCGI Demux Record Length Field
18 Jun 202616:05
cvelist
Debian CVE
CVE-2026-55203
18 Jun 202616:05
debiancve
EUVD
EUVD-2026-37905
18 Jun 202616:05
euvd
Microsoft CVE
HAProxy - Integer Overflow in FCGI Demux Record Length Field
27 Jun 202608:07
mscve
NVD
CVE-2026-55203
18 Jun 202617:16
nvd
Rows per page
NVD
Vulners
CNA
Node
haproxyhaproxyRange3.4.0
[
  {
    "vendor": "haproxy",
    "product": "haproxy",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "0",
        "status": "affected",
        "versionType": "semver",
        "lessThanOrEqual": "3.4.0"
      },
      {
        "status": "unaffected",
        "version": "5985276735777634d8c85f1d73bb7764aab0d6dd",
        "versionType": "git"
      }
    ],
    "repo": "https://github.com/haproxy/haproxy"
  }
]

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26 Jun 2026 02:47Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.17.5 - 9.1
CVSS 49
EPSS0.00321
SSVC
51