Vulnerability-Lookup

CVE-2026-40562 (GCVE-0-2026-40562)

Vulnerability from cvelistv5 – Published: 2026-05-06 12:36 – Updated: 2026-05-07 16:13

Title

Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence

Summary

Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Gazelle incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-06 14:14 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 62/100 over 337 records in the last 180 days details

References

4 references

URL	Tags
https://datatracker.ietf.org/doc/html/rfc7230#sec…
https://security.metacpan.org/patches/G/Gazelle/0…	patch
https://metacpan.org/release/KAZEBURO/Gazelle-0.5…	release-notes
http://www.openwall.com/lists/oss-security/2026/05/06/7

Impacted products

1 product

Vendor	Product	Version	CPE status
KAZEBURO	Gazelle	Affected: 0 , ≤ 0.49 (custom)	guessed

Credits

CPANSec

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-40562

Vulnerability from fkie_nvd - Published: 2026-05-06 13:16 - Updated: 2026-10-26 19:10

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

URL	Tags
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3	Third Party Advisory
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes	Release Notes
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch	Patch
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/06/7	Mailing List, Third Party Advisory

Impacted products

	Vendor	Product	Version
	kazeburo	gazelle	*

JSON

To clipboard

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    {
      "lang": "en",
      "value": "Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle incorrectly prioritizes \"Content-Length\" over \"Transfer-Encoding: chunked\" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy."
    },
    {
      "lang": "es",
      "value": "Las versiones de Gazelle hasta la 0.49 para Perl permiten el Contrabando de Solicitudes HTTP a trav\u00e9s de una Precedencia de Encabezado Inadecuada.\n\nGazelle prioriza incorrectamente \u2019Content-Length\u2019 sobre \u2019Transfer-Encoding: chunked\u2019 cuando ambos encabezados est\u00e1n presentes en una solicitud HTTP. Seg\u00fan la RFC 7230 3.3.3, Transfer-Encoding debe tener precedencia.\n\nUn atacante podr\u00eda explotar esto para contrabandear solicitudes HTTP maliciosas a trav\u00e9s de un proxy inverso de front-end."
    }
  ],
  "id": "CVE-2026-40562",
  "lastModified": "2026-10-26T19:10:00.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40562",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-06T14:14:25.637199Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-06T13:16:09.110",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Release Notes"
      ],
      "url": "https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ],
      "url": "https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/05/06/7"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-MJW2-GF6P-382H

Vulnerability from github – Published: 2026-05-06 15:32 – Updated: 2026-05-07 18:30

Details

Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.

Gazelle incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.

An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.

Severity

7.5 (High)


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

Show details on source website

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To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-40562"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T13:16:09Z",
    "severity": "HIGH"
  },
  "details": "Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle incorrectly prioritizes \"Content-Length\" over \"Transfer-Encoding: chunked\" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.",
  "id": "GHSA-mjw2-gf6p-382h",
  "modified": "2026-05-07T18:30:36Z",
  "published": "2026-05-06T15:32:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40562"
    },
    {
      "type": "WEB",
      "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes"
    },
    {
      "type": "WEB",
      "url": "https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/06/7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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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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Action not permitted

CVE-2026-40562 (GCVE-0-2026-40562)

FKIE_CVE-2026-40562

GHSA-MJW2-GF6P-382H

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