Vulnerability-Lookup

CERTFR-2026-AVI-0814

Vulnerability from certfr_avis - Published: 2026-06-29 - Updated: 2026-06-29

Une vulnérabilité a été découverte dans HAProxy. Elle permet à un attaquant de provoquer un déni de service à distance.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
HAProxy	HAProxy ALOHA	ALOHA versions 16.5.x antérieures à 16.5.39
HAProxy	HAProxy Enterprise	Enterprise versions hapee-2.8r1 antérieures à 2.8r1-341.1462
HAProxy	HAProxy ALOHA	ALOHA versions 14.5.x antérieures à 14.5.46
HAProxy	HAProxy Enterprise	Enterprise versions hapee-3.3r1 antérieures à 3.3r1-375.672
HAProxy	HAProxy Enterprise	Enterprise versions hapee-2.6r1 antérieures à 1.0.0-308.1822
HAProxy	HAProxy Community / Performance Packages	Community Edition toutes versions (mise à jour à venir)
HAProxy	HAProxy ALOHA	ALOHA versions 18.0.x antérieures à 18.0.8
HAProxy	HAProxy ALOHA	ALOHA versions 17.5.x antérieures à 17.5.29
HAProxy	HAProxy Enterprise	Enterprise versions hapee-3.2r1 antérieures à 3.2r1-376.966
HAProxy	HAProxy ALOHA	ALOHA versions 15.5.x antérieures à 15.5.45
HAProxy	HAProxy Enterprise	Enterprise versions hapee-3.0r1 antérieures à 3.0r1-360.1200

References

Title

Publication Time

Tags

Bulletin de sécurité HAProxy june-2026-cve-2026-55204-null-pointer-dereference-in-haproxys-hpack-header-handling

2026-06-26

vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "ALOHA versions 16.5.x ant\u00e9rieures \u00e0 16.5.39",
      "product": {
        "name": "HAProxy ALOHA",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "Enterprise versions hapee-2.8r1 ant\u00e9rieures \u00e0 2.8r1-341.1462",
      "product": {
        "name": "HAProxy Enterprise",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "ALOHA versions 14.5.x ant\u00e9rieures \u00e0 14.5.46",
      "product": {
        "name": "HAProxy ALOHA",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "Enterprise versions hapee-3.3r1 ant\u00e9rieures \u00e0 3.3r1-375.672",
      "product": {
        "name": "HAProxy Enterprise",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "Enterprise versions hapee-2.6r1 ant\u00e9rieures \u00e0 1.0.0-308.1822",
      "product": {
        "name": "HAProxy Enterprise",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "Community Edition toutes versions (mise \u00e0 jour \u00e0 venir)",
      "product": {
        "name": "HAProxy Community / Performance Packages",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "ALOHA versions 18.0.x ant\u00e9rieures \u00e0 18.0.8",
      "product": {
        "name": "HAProxy ALOHA",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "ALOHA versions 17.5.x ant\u00e9rieures \u00e0 17.5.29",
      "product": {
        "name": "HAProxy ALOHA",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "Enterprise versions hapee-3.2r1 ant\u00e9rieures \u00e0 3.2r1-376.966",
      "product": {
        "name": "HAProxy Enterprise",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "ALOHA versions 15.5.x ant\u00e9rieures \u00e0 15.5.45",
      "product": {
        "name": "HAProxy ALOHA",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    },
    {
      "description": "Enterprise versions hapee-3.0r1 ant\u00e9rieures \u00e0 3.0r1-360.1200",
      "product": {
        "name": "HAProxy Enterprise",
        "vendor": {
          "name": "HAProxy",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-55204",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-55204"
    }
  ],
  "initial_release_date": "2026-06-29T00:00:00",
  "last_revision_date": "2026-06-29T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0814",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-06-29T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "D\u00e9ni de service \u00e0 distance"
    }
  ],
  "summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans HAProxy. Elle permet \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance.",
  "title": "Vuln\u00e9rabilit\u00e9 dans HAProxy",
  "vendor_advisories": [
    {
      "published_at": "2026-06-26",
      "title": "Bulletin de s\u00e9curit\u00e9 HAProxy june-2026-cve-2026-55204-null-pointer-dereference-in-haproxys-hpack-header-handling",
      "url": "https://www.haproxy.com/blog/june-2026-cve-2026-55204-null-pointer-dereference-in-haproxys-hpack-header-handling"
    }
  ]
}

CVE-2026-55204 (GCVE-0-2026-55204)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:05 – Updated: 2026-06-18 17:26 X_Open Source

Title

HAProxy - NULL Pointer Dereference in hpack_dht_insert Function

Summary

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 trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-476 - NULL Pointer Dereference

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/haproxy/haproxy/commit/9a6d1fe…	patch
https://www.vulncheck.com/advisories/haproxy-null…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
haproxy	haproxy	Affected: 0 , ≤ 3.4.0 (semver) Unaffected: 9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513 (git)

Date Public

2026-06-16 00:00

Credits

Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55204",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T17:26:27.738915Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-18T17:26:38.498Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "haproxy",
          "repo": "https://github.com/haproxy/haproxy",
          "vendor": "haproxy",
          "versions": [
            {
              "lessThanOrEqual": "3.4.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "version": "9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:haproxy:aloha:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "3.4.0",
                  "vulnerable": true
                }
              ],
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
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          "type": "finder",
          "value": "Tristan Madani (@TristanInSec)"
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        {
          "lang": "en",
          "value": "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 trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
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          "descriptions": [
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      "providerMetadata": {
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          "name": "Patch Commit",
          "tags": [
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        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/haproxy-null-pointer-dereference-in-hpack-dht-insert-function"
        }
      ],
      "tags": [
        "x_open-source"
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      "title": "HAProxy - NULL Pointer Dereference in hpack_dht_insert Function",
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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    "datePublished": "2026-06-18T16:05:52.058Z",
    "dateReserved": "2026-06-16T15:53:37.765Z",
    "dateUpdated": "2026-06-18T17:26:38.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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