CVE-2026-6276 (GCVE-0-2026-6276)

Vulnerability from cvelistv5 – Published: 2026-05-13 08:28 – Updated: 2026-09-15 06:03
VLAI
Title
stale custom cookie host causes cookie leak
Summary
Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 17:24 UTC
CWE
  • CWE-346 - Origin Validation Error
Impacted products
Vendor Product Version
curl curl Affected: 7.71.0 , < 8.14.2 (semver)
Affected: 8.15.0 , < 8.16.1 (semver)
Affected: 8.17.0 , < 8.20.0 (semver)
Create a notification for this product.
curl curl Affected: e15e51384a423be31318b3c9c7d612a1aae661fd , < 3a19987a87f393d9394fe5acc7643f6c263c92db (git)
Create a notification for this product.
curl curl Affected: 8.19.0
Affected: 8.18.0
Affected: 8.17.0
Affected: 8.16.0
Affected: 8.15.0
Affected: 8.14.1
Affected: 8.14.0
Affected: 8.13.0
Affected: 8.12.1
Affected: 8.12.0
Affected: 8.11.1
Affected: 8.11.0
Affected: 8.10.1
Affected: 8.10.0
Affected: 8.9.1
Affected: 8.9.0
Affected: 8.8.0
Affected: 8.7.1
Affected: 8.7.0
Affected: 8.6.0
Affected: 8.5.0
Affected: 8.4.0
Affected: 8.3.0
Affected: 8.2.1
Affected: 8.2.0
Affected: 8.1.2
Affected: 8.1.1
Affected: 8.1.0
Affected: 8.0.1
Affected: 8.0.0
Affected: 7.88.1
Affected: 7.88.0
Affected: 7.87.0
Affected: 7.86.0
Affected: 7.85.0
Affected: 7.84.0
Affected: 7.83.1
Affected: 7.83.0
Affected: 7.82.0
Affected: 7.81.0
Affected: 7.80.0
Affected: 7.79.1
Affected: 7.79.0
Affected: 7.78.0
Affected: 7.77.0
Affected: 7.76.1
Affected: 7.76.0
Affected: 7.75.0
Affected: 7.74.0
Affected: 7.73.0
Affected: 7.72.0
Affected: 7.71.1
Affected: 7.71.0
Create a notification for this product.
Show details on NVD website

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                  "version": "7.79.1"
                },
                {
                  "status": "affected",
                  "version": "7.79.0"
                },
                {
                  "status": "affected",
                  "version": "7.78.0"
                },
                {
                  "status": "affected",
                  "version": "7.77.0"
                },
                {
                  "status": "affected",
                  "version": "7.76.1"
                },
                {
                  "status": "affected",
                  "version": "7.76.0"
                },
                {
                  "status": "affected",
                  "version": "7.75.0"
                },
                {
                  "status": "affected",
                  "version": "7.74.0"
                },
                {
                  "status": "affected",
                  "version": "7.73.0"
                },
                {
                  "status": "affected",
                  "version": "7.72.0"
                },
                {
                  "status": "affected",
                  "version": "7.71.1"
                },
                {
                  "status": "affected",
                  "version": "7.71.0"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Muhamad Arga Reksapati"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Daniel Stenberg"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Using libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-346",
                  "description": "Origin Validation Error",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-15T06:03:04.059Z",
            "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
            "shortName": "curl"
          },
          "references": [
            {
              "url": "https://curl.se/docs/CVE-2026-6276.json"
            },
            {
              "url": "https://curl.se/docs/CVE-2026-6276.html"
            },
            {
              "url": "https://hackerone.com/reports/3671818"
            }
          ],
          "title": "stale custom cookie host causes cookie leak",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_osv": {
            "affected": [
              {
                "ranges": [
                  {
                    "events": [
                      {
                        "introduced": "7.71.0"
                      },
                      {
                        "fixed": "8.14.2"
                      },
                      {
                        "introduced": "8.15.0"
                      },
                      {
                        "fixed": "8.16.1"
                      },
                      {
                        "introduced": "8.17.0"
                      },
                      {
                        "fixed": "8.20.0"
                      }
                    ],
                    "type": "SEMVER"
                  },
                  {
                    "events": [
                      {
                        "introduced": "e15e51384a423be31318b3c9c7d612a1aae661fd"
                      },
                      {
                        "fixed": "3a19987a87f393d9394fe5acc7643f6c263c92db"
                      }
                    ],
                    "repo": "https://github.com/curl/curl.git",
                    "type": "GIT"
                  }
                ],
                "versions": [
                  "8.19.0",
                  "8.18.0",
                  "8.17.0",
                  "8.16.0",
                  "8.15.0",
                  "8.14.1",
                  "8.14.0",
                  "8.13.0",
                  "8.12.1",
                  "8.12.0",
                  "8.11.1",
                  "8.11.0",
                  "8.10.1",
                  "8.10.0",
                  "8.9.1",
                  "8.9.0",
                  "8.8.0",
                  "8.7.1",
                  "8.7.0",
                  "8.6.0",
                  "8.5.0",
                  "8.4.0",
                  "8.3.0",
                  "8.2.1",
                  "8.2.0",
                  "8.1.2",
                  "8.1.1",
                  "8.1.0",
                  "8.0.1",
                  "8.0.0",
                  "7.88.1",
                  "7.88.0",
                  "7.87.0",
                  "7.86.0",
                  "7.85.0",
                  "7.84.0",
                  "7.83.1",
                  "7.83.0",
                  "7.82.0",
                  "7.81.0",
                  "7.80.0",
                  "7.79.1",
                  "7.79.0",
                  "7.78.0",
                  "7.77.0",
                  "7.76.1",
                  "7.76.0",
                  "7.75.0",
                  "7.74.0",
                  "7.73.0",
                  "7.72.0",
                  "7.71.1",
                  "7.71.0"
                ]
              }
            ],
            "aliases": [
              "CVE-2026-6276"
            ],
            "credits": [
              {
                "name": "Muhamad Arga Reksapati",
                "type": "finder"
              },
              {
                "name": "Daniel Stenberg",
                "type": "remediation developer"
              }
            ],
            "database_specific": {
              "CWE": {
                "desc": "Origin Validation Error",
                "id": "CWE-346"
              },
              "URL": "https://curl.se/docs/CVE-2026-6276.json",
              "affects": "lib",
              "issue": "https://hackerone.com/reports/3671818",
              "last_affected": "8.19.0",
              "package": "curl",
              "severity": "Low",
              "www": "https://curl.se/docs/CVE-2026-6276.html"
            },
            "details": "Using libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.",
            "id": "CURL-CVE-2026-6276",
            "modified": "2026-09-07T10:34:51.00Z",
            "published": "2026-04-29T08:00:00.00Z",
            "schema_version": "1.5.0",
            "summary": "stale custom cookie host causes cookie leak"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "assignerShortName": "curl",
        "cveId": "CVE-2026-6276",
        "datePublished": "2026-05-13T08:28:19.273Z",
        "dateReserved": "2026-04-14T14:01:54.772Z",
        "dateUpdated": "2026-09-15T06:03:04.059Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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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.


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