CVE-2026-6276 (GCVE-0-2026-6276)
Vulnerability from cvelistv5
Published
2026-05-13 08:28
Modified
2026-09-15 06:03
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-346 - Origin Validation Error
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.
References
Impacted products
Vendor Product Version
curl curl Version: 7.71.0   ≤
Version: 8.15.0   ≤
Version: 8.17.0   ≤
Create a notification for this product.
   curl curl Version: e15e51384a423be31318b3c9c7d612a1aae661fd
 Create a notification for this product.
   curl curl Version: 8.19.0
Version: 8.18.0
Version: 8.17.0
Version: 8.16.0
Version: 8.15.0
Version: 8.14.1
Version: 8.14.0
Version: 8.13.0
Version: 8.12.1
Version: 8.12.0
Version: 8.11.1
Version: 8.11.0
Version: 8.10.1
Version: 8.10.0
Version: 8.9.1
Version: 8.9.0
Version: 8.8.0
Version: 8.7.1
Version: 8.7.0
Version: 8.6.0
Version: 8.5.0
Version: 8.4.0
Version: 8.3.0
Version: 8.2.1
Version: 8.2.0
Version: 8.1.2
Version: 8.1.1
Version: 8.1.0
Version: 8.0.1
Version: 8.0.0
Version: 7.88.1
Version: 7.88.0
Version: 7.87.0
Version: 7.86.0
Version: 7.85.0
Version: 7.84.0
Version: 7.83.1
Version: 7.83.0
Version: 7.82.0
Version: 7.81.0
Version: 7.80.0
Version: 7.79.1
Version: 7.79.0
Version: 7.78.0
Version: 7.77.0
Version: 7.76.1
Version: 7.76.0
Version: 7.75.0
Version: 7.74.0
Version: 7.73.0
Version: 7.72.0
Version: 7.71.1
Version: 7.71.0
 Create a notification for this product.
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    "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"
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\"version\": \"8.1.2\"}, {\"status\": \"affected\", \"version\": \"8.1.1\"}, {\"status\": \"affected\", \"version\": \"8.1.0\"}, {\"status\": \"affected\", \"version\": \"8.0.1\"}, {\"status\": \"affected\", \"version\": \"8.0.0\"}, {\"status\": \"affected\", \"version\": \"7.88.1\"}, {\"status\": \"affected\", \"version\": \"7.88.0\"}, {\"status\": \"affected\", \"version\": \"7.87.0\"}, {\"status\": \"affected\", \"version\": \"7.86.0\"}, {\"status\": \"affected\", \"version\": \"7.85.0\"}, {\"status\": \"affected\", \"version\": \"7.84.0\"}, {\"status\": \"affected\", \"version\": \"7.83.1\"}, {\"status\": \"affected\", \"version\": \"7.83.0\"}, {\"status\": \"affected\", \"version\": \"7.82.0\"}, {\"status\": \"affected\", \"version\": \"7.81.0\"}, {\"status\": \"affected\", \"version\": \"7.80.0\"}, {\"status\": \"affected\", \"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\"}], \"defaultStatus\": \"unaffected\"}], \"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\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"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\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-346\", \"description\": \"Origin Validation Error\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-09-15T06:03:04.059Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-6276\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:03:04.059Z\", \"dateReserved\": \"2026-04-14T14:01:54.772Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-05-13T08:28:19.273Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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