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

Vulnerability from cvelistv5 – Published: 2026-05-13 08:28 – Updated: 2026-05-13 17:26
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
curl curl Affected: 8.19.0 , ≤ 8.19.0 (semver)
Affected: 8.18.0 , ≤ 8.18.0 (semver)
Affected: 8.17.0 , ≤ 8.17.0 (semver)
Affected: 8.16.0 , ≤ 8.16.0 (semver)
Affected: 8.15.0 , ≤ 8.15.0 (semver)
Affected: 8.14.1 , ≤ 8.14.1 (semver)
Affected: 8.14.0 , ≤ 8.14.0 (semver)
Affected: 8.13.0 , ≤ 8.13.0 (semver)
Affected: 8.12.1 , ≤ 8.12.1 (semver)
Affected: 8.12.0 , ≤ 8.12.0 (semver)
Affected: 8.11.1 , ≤ 8.11.1 (semver)
Affected: 8.11.0 , ≤ 8.11.0 (semver)
Affected: 8.10.1 , ≤ 8.10.1 (semver)
Affected: 8.10.0 , ≤ 8.10.0 (semver)
Affected: 8.9.1 , ≤ 8.9.1 (semver)
Affected: 8.9.0 , ≤ 8.9.0 (semver)
Affected: 8.8.0 , ≤ 8.8.0 (semver)
Affected: 8.7.1 , ≤ 8.7.1 (semver)
Affected: 8.7.0 , ≤ 8.7.0 (semver)
Affected: 8.6.0 , ≤ 8.6.0 (semver)
Affected: 8.5.0 , ≤ 8.5.0 (semver)
Affected: 8.4.0 , ≤ 8.4.0 (semver)
Affected: 8.3.0 , ≤ 8.3.0 (semver)
Affected: 8.2.1 , ≤ 8.2.1 (semver)
Affected: 8.2.0 , ≤ 8.2.0 (semver)
Affected: 8.1.2 , ≤ 8.1.2 (semver)
Affected: 8.1.1 , ≤ 8.1.1 (semver)
Affected: 8.1.0 , ≤ 8.1.0 (semver)
Affected: 8.0.1 , ≤ 8.0.1 (semver)
Affected: 8.0.0 , ≤ 8.0.0 (semver)
Affected: 7.88.1 , ≤ 7.88.1 (semver)
Affected: 7.88.0 , ≤ 7.88.0 (semver)
Affected: 7.87.0 , ≤ 7.87.0 (semver)
Affected: 7.86.0 , ≤ 7.86.0 (semver)
Affected: 7.85.0 , ≤ 7.85.0 (semver)
Affected: 7.84.0 , ≤ 7.84.0 (semver)
Affected: 7.83.1 , ≤ 7.83.1 (semver)
Affected: 7.83.0 , ≤ 7.83.0 (semver)
Affected: 7.82.0 , ≤ 7.82.0 (semver)
Affected: 7.81.0 , ≤ 7.81.0 (semver)
Affected: 7.80.0 , ≤ 7.80.0 (semver)
Affected: 7.79.1 , ≤ 7.79.1 (semver)
Affected: 7.79.0 , ≤ 7.79.0 (semver)
Affected: 7.78.0 , ≤ 7.78.0 (semver)
Affected: 7.77.0 , ≤ 7.77.0 (semver)
Affected: 7.76.1 , ≤ 7.76.1 (semver)
Affected: 7.76.0 , ≤ 7.76.0 (semver)
Affected: 7.75.0 , ≤ 7.75.0 (semver)
Affected: 7.74.0 , ≤ 7.74.0 (semver)
Affected: 7.73.0 , ≤ 7.73.0 (semver)
Affected: 7.72.0 , ≤ 7.72.0 (semver)
Affected: 7.71.1 , ≤ 7.71.1 (semver)
Affected: 7.71.0 , ≤ 7.71.0 (semver)
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Credits
Muhamad Arga Reksapati Daniel Stenberg
Show details on NVD website
To clipboard 

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\"version\": \"2.0.3\", \"timestamp\": \"2026-05-13T17:24:29.094167Z\"}}}], \"references\": [{\"url\": \"https://hackerone.com/reports/3671818\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-13T17:20:27.337Z\"}}], \"cna\": {\"title\": \"stale custom cookie host causes cookie leak\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Muhamad Arga Reksapati\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Daniel Stenberg\"}], \"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.19.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.19.0\"}, {\"status\": \"affected\", \"version\": \"8.18.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.18.0\"}, {\"status\": \"affected\", \"version\": \"8.17.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": 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\"versionType\": \"semver\", \"lessThanOrEqual\": \"8.11.0\"}, {\"status\": \"affected\", \"version\": \"8.10.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.10.1\"}, {\"status\": \"affected\", \"version\": \"8.10.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.10.0\"}, {\"status\": \"affected\", \"version\": \"8.9.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.9.1\"}, {\"status\": \"affected\", \"version\": \"8.9.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.9.0\"}, {\"status\": \"affected\", \"version\": \"8.8.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.8.0\"}, {\"status\": \"affected\", \"version\": \"8.7.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.7.1\"}, {\"status\": \"affected\", \"version\": \"8.7.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.7.0\"}, {\"status\": \"affected\", \"version\": \"8.6.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.6.0\"}, {\"status\": \"affected\", \"version\": \"8.5.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.5.0\"}, {\"status\": \"affected\", \"version\": \"8.4.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.4.0\"}, {\"status\": \"affected\", \"version\": \"8.3.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.3.0\"}, {\"status\": \"affected\", \"version\": \"8.2.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.2.1\"}, {\"status\": \"affected\", \"version\": \"8.2.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.2.0\"}, {\"status\": \"affected\", \"version\": \"8.1.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.2\"}, {\"status\": \"affected\", \"version\": \"8.1.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.1\"}, {\"status\": \"affected\", \"version\": \"8.1.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.0\"}, {\"status\": \"affected\", \"version\": \"8.0.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.0.1\"}, {\"status\": \"affected\", \"version\": \"8.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.0.0\"}, {\"status\": \"affected\", \"version\": \"7.88.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.88.1\"}, {\"status\": \"affected\", \"version\": \"7.88.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.88.0\"}, {\"status\": \"affected\", \"version\": \"7.87.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.87.0\"}, {\"status\": \"affected\", \"version\": \"7.86.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.86.0\"}, {\"status\": \"affected\", \"version\": \"7.85.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.85.0\"}, {\"status\": \"affected\", \"version\": \"7.84.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.84.0\"}, {\"status\": \"affected\", \"version\": \"7.83.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.83.1\"}, {\"status\": \"affected\", \"version\": \"7.83.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.83.0\"}, {\"status\": \"affected\", \"version\": \"7.82.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.82.0\"}, {\"status\": \"affected\", \"version\": \"7.81.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.81.0\"}, {\"status\": \"affected\", \"version\": \"7.80.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.80.0\"}, {\"status\": \"affected\", \"version\": \"7.79.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.79.1\"}, {\"status\": \"affected\", \"version\": \"7.79.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.79.0\"}, {\"status\": \"affected\", \"version\": \"7.78.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.78.0\"}, {\"status\": \"affected\", \"version\": \"7.77.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.77.0\"}, {\"status\": \"affected\", \"version\": \"7.76.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.76.1\"}, {\"status\": \"affected\", \"version\": \"7.76.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.76.0\"}, {\"status\": \"affected\", \"version\": \"7.75.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.75.0\"}, {\"status\": \"affected\", \"version\": \"7.74.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.74.0\"}, {\"status\": \"affected\", \"version\": \"7.73.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.73.0\"}, {\"status\": \"affected\", \"version\": \"7.72.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.72.0\"}, {\"status\": \"affected\", \"version\": \"7.71.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.71.1\"}, {\"status\": \"affected\", \"version\": \"7.71.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.71.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-6276.json\", \"name\": \"json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-6276.html\", \"name\": \"www\"}, {\"url\": \"https://hackerone.com/reports/3671818\", \"name\": \"issue\"}], \"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\", \"description\": \"CWE-346 Origin Validation Error\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-05-13T08:28:19.273Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-6276\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-13T17:26:06.894Z\", \"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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Tags
Taxonomy of the tags.




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.



Detection rules are retrieved from Rulezet.