Vulnerability-Lookup

OESA-2026-2794 (CVE-2026-55203)

Vulnerability from osv_openeuler – Published: 2026-06-24 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

haproxy security update

Details

HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones.

Security Fix(es):

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 wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues.(CVE-2026-55203)

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.(CVE-2026-55204)

Severity

7.5 (High)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-55203	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-55204	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "haproxy-2.2.16-10.oe2003sp4.aarch64.rpm",
          "haproxy-debuginfo-2.2.16-10.oe2003sp4.aarch64.rpm",
          "haproxy-debugsource-2.2.16-10.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "haproxy-help-2.2.16-10.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "haproxy-2.2.16-10.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "haproxy-2.2.16-10.oe2003sp4.x86_64.rpm",
          "haproxy-debuginfo-2.2.16-10.oe2003sp4.x86_64.rpm",
          "haproxy-debugsource-2.2.16-10.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "haproxy",
        "purl": "pkg:rpm/openEuler/haproxy\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.16-10.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "haproxy-2.6.6-20.oe2203sp4.aarch64.rpm",
          "haproxy-debuginfo-2.6.6-20.oe2203sp4.aarch64.rpm",
          "haproxy-debugsource-2.6.6-20.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "haproxy-help-2.6.6-20.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "haproxy-2.6.6-20.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "haproxy-2.6.6-20.oe2203sp4.x86_64.rpm",
          "haproxy-debuginfo-2.6.6-20.oe2203sp4.x86_64.rpm",
          "haproxy-debugsource-2.6.6-20.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "haproxy",
        "purl": "pkg:rpm/openEuler/haproxy\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.6-20.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "haproxy-2.9.5-14.oe2403sp1.aarch64.rpm",
          "haproxy-debuginfo-2.9.5-14.oe2403sp1.aarch64.rpm",
          "haproxy-debugsource-2.9.5-14.oe2403sp1.aarch64.rpm"
        ],
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          "haproxy-help-2.9.5-14.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "haproxy-2.9.5-14.oe2403sp1.src.rpm"
        ],
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          "haproxy-2.9.5-14.oe2403sp1.x86_64.rpm",
          "haproxy-debuginfo-2.9.5-14.oe2403sp1.x86_64.rpm",
          "haproxy-debugsource-2.9.5-14.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "haproxy",
        "purl": "pkg:rpm/openEuler/haproxy\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.5-14.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "haproxy-3.0.11-3.oe2403sp3.aarch64.rpm",
          "haproxy-debuginfo-3.0.11-3.oe2403sp3.aarch64.rpm",
          "haproxy-debugsource-3.0.11-3.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "haproxy-help-3.0.11-3.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "haproxy-3.0.11-3.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "haproxy-3.0.11-3.oe2403sp3.x86_64.rpm",
          "haproxy-debuginfo-3.0.11-3.oe2403sp3.x86_64.rpm",
          "haproxy-debugsource-3.0.11-3.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "haproxy",
        "purl": "pkg:rpm/openEuler/haproxy\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.11-3.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world\u0026amp;apos;s most visited ones.\r\n\r\nSecurity Fix(es):\n\nHAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure\u0026apos;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 wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues.(CVE-2026-55203)\n\nHAProxy 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.(CVE-2026-55204)",
  "id": "OESA-2026-2794",
  "modified": "2026-08-06T11:11:43Z",
  "published": "2026-06-24T11:11:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2794"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55203"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55204"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "haproxy security update",
  "upstream": [
    "CVE-2026-55203",
    "CVE-2026-55204"
  ]
}

CVE-2026-55203 (GCVE-0-2026-55203)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:05 – Updated: 2026-07-14 21:33 X_Open Source

Title

HAProxy - Integer Overflow in FCGI Demux Record Length Field

Summary

Severity

9 (Critical)


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

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 02:04 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/haproxy/haproxy/commit/5985276…	patch
https://www.vulncheck.com/advisories/haproxy-inte…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
haproxy	haproxy	Affected: 0 , ≤ 3.4.0 (semver) Unaffected: 5985276735777634d8c85f1d73bb7764aab0d6dd (git) cpe:2.3:a:haproxy:aloha::::::::

Date Public

2026-06-16 00:00

Credits

Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

To clipboard

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

Vulnerability from cvelistv5 – Published: 2026-06-18 16:05 – Updated: 2026-07-14 21:33 X_Open Source

Title

HAProxy - NULL Pointer Dereference in hpack_dht_insert Function

Summary

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-06-18 17:26 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

VulnCheck mitre root

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) cpe:2.3:a:haproxy:aloha::::::::

Date Public

2026-06-16 00:00

Credits

Tristan Madani (@TristanInSec)

Show details on NVD website

JSON

To clipboard

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      "references": [
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/haproxy/haproxy/commit/9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/haproxy-null-pointer-dereference-in-hpack-dht-insert-function"
        }
      ],
      "tags": [
        "x_open-source"
      ],
      "title": "HAProxy - NULL Pointer Dereference in hpack_dht_insert Function",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-55204",
    "datePublished": "2026-06-18T16:05:52.058Z",
    "dateReserved": "2026-06-16T15:53:37.765Z",
    "dateUpdated": "2026-07-14T21:33:57.879Z",
    "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-2794 (CVE-2026-55203)

CVE-2026-55203 (GCVE-0-2026-55203)

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

Tags

Sightings

Nomenclature

Related by attack behaviour