Vulnerability-Lookup

GHSA-P9CC-QC4F-7X35

Vulnerability from github – Published: 2026-10-22 03:33 – Updated: 2026-10-22 03:33

Details

HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-110353"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-252"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-22T03:16:31Z",
    "severity": "HIGH"
  },
  "details": "HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.",
  "id": "GHSA-p9cc-qc4f-7x35",
  "modified": "2026-10-22T03:33:49Z",
  "published": "2026-10-22T03:33:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110353"
    },
    {
      "type": "WEB",
      "url": "https://git.haproxy.org/?p=haproxy.git;a=commit;h=cec63e95f62a7412484f1134f5aa227e5b7e1466"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-110353 (GCVE-0-2026-110353)

Vulnerability from cvelistv5 – Published: 2026-10-22 02:53 – Updated: 2026-10-22 19:10

Summary

Severity

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 2026-10-22 13:42 UTC

CWE

CWE-252 - Unchecked Return Value

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2361 records in the last 180 days details

References

1 reference

URL	Tags
https://git.haproxy.org/?p=haproxy.git;a=commit;h…	vendor-advisory

Impacted products

4 products

Vendor	Product	Version
HAProxy	HAProxy	Affected: 3.2.0 , < 3.2.26 (custom) Affected: 3.3.0 , < 3.3.17 (custom) Affected: 3.4.0 , < 3.4.6 (custom) Affected: 3.5-dev , < 3.5-dev9 (custom)
HAProxy	HAProxy Enterprise Edition	Affected: 3.2.0r1 , < 3.2r1-378.1259 (custom) Affected: 3.3.0r1 , < 3.3r1-377.1005 (custom)
HAProxy	Kubernetes Ingress Controller	Affected: 3.2.0 , < 3.2.17 (custom)
Haproxy	Kubernetes Ingress Controller Enterprise	Affected: 3.2.0 , < 3.2.17-ee1 (custom) Affected: 3.0 , < 3.0.16-ee17 (custom) Affected: 1.11 , < 1.11.14-ee11 (custom)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-110353",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-22T13:42:53.833295Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-22T19:10:34.428Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "mux-h2"
          ],
          "product": "HAProxy",
          "programFiles": [
            "src/mux_h2.c"
          ],
          "programRoutines": [
            {
              "name": "h2c_handle_ping"
            }
          ],
          "repo": "https://git.haproxy.org/git/haproxy.git/",
          "vendor": "HAProxy",
          "versions": [
            {
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              "status": "affected",
              "version": "3.2.0",
              "versionType": "custom"
            },
            {
              "lessThan": "3.3.17",
              "status": "affected",
              "version": "3.3.0",
              "versionType": "custom"
            },
            {
              "lessThan": "3.4.6",
              "status": "affected",
              "version": "3.4.0",
              "versionType": "custom"
            },
            {
              "lessThan": "3.5-dev9",
              "status": "affected",
              "version": "3.5-dev",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "HAProxy Enterprise Edition",
          "vendor": "HAProxy",
          "versions": [
            {
              "lessThan": "3.2r1-378.1259",
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              "version": "3.2.0r1",
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            },
            {
              "lessThan": "3.3r1-377.1005",
              "status": "affected",
              "version": "3.3.0r1",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Kubernetes Ingress Controller",
          "vendor": "HAProxy",
          "versions": [
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              "lessThan": "3.2.17",
              "status": "affected",
              "version": "3.2.0",
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          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Kubernetes Ingress Controller Enterprise",
          "vendor": "Haproxy",
          "versions": [
            {
              "lessThan": "3.2.17-ee1",
              "status": "affected",
              "version": "3.2.0",
              "versionType": "custom"
            },
            {
              "lessThan": "3.0.16-ee17",
              "status": "affected",
              "version": "3.0",
              "versionType": "custom"
            },
            {
              "lessThan": "1.11.14-ee11",
              "status": "affected",
              "version": "1.11",
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            }
          ]
        }
      ],
      "descriptions": [
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "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": [
        {
          "descriptions": [
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              "description": "CWE-252 Unchecked Return Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-22T02:53:33.198Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://git.haproxy.org/?p=haproxy.git;a=commit;h=cec63e95f62a7412484f1134f5aa227e5b7e1466"
        }
      ],
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  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-110353",
    "datePublished": "2026-10-22T02:53:33.198Z",
    "dateReserved": "2026-10-13T23:18:04.062Z",
    "dateUpdated": "2026-10-22T19:10:34.428Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
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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.

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