{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6276","assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","state":"PUBLISHED","assignerShortName":"curl","dateReserved":"2026-04-14T14:01:54.772Z","datePublished":"2026-05-13T08:28:19.273Z","dateUpdated":"2026-05-13T17:26:06.894Z"},"containers":{"cna":{"title":"stale custom cookie host causes cookie leak","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."}],"providerMetadata":{"orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl","dateUpdated":"2026-05-13T08:28:19.273Z"},"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-346 Origin Validation Error"}]}],"affected":[{"vendor":"curl","product":"curl","versions":[{"version":"8.19.0","status":"affected","lessThanOrEqual":"8.19.0","versionType":"semver"},{"version":"8.18.0","status":"affected","lessThanOrEqual":"8.18.0","versionType":"semver"},{"version":"8.17.0","status":"affected","lessThanOrEqual":"8.17.0","versionType":"semver"},{"version":"8.16.0","status":"affected","lessThanOrEqual":"8.16.0","versionType":"semver"},{"version":"8.15.0","status":"affected","lessThanOrEqual":"8.15.0","versionType":"semver"},{"version":"8.14.1","status":"affected","lessThanOrEqual":"8.14.1","versionType":"semver"},{"version":"8.14.0","status":"affected","lessThanOrEqual":"8.14.0","versionType":"semver"},{"version":"8.13.0","status":"affected","lessThanOrEqual":"8.13.0","versionType":"semver"},{"version":"8.12.1","status":"affected","lessThanOrEqual":"8.12.1","versionType":"semver"},{"version":"8.12.0","status":"affected","lessThanOrEqual":"8.12.0","versionType":"semver"},{"version":"8.11.1","status":"affected","lessThanOrEqual":"8.11.1","versionType":"semver"},{"version":"8.11.0","status":"affected","lessThanOrEqual":"8.11.0","versionType":"semver"},{"version":"8.10.1","status":"affected","lessThanOrEqual":"8.10.1","versionType":"semver"},{"version":"8.10.0","status":"affected","lessThanOrEqual":"8.10.0","versionType":"semver"},{"version":"8.9.1","status":"affected","lessThanOrEqual":"8.9.1","versionType":"semver"},{"version":"8.9.0","status":"affected","lessThanOrEqual":"8.9.0","versionType":"semver"},{"version":"8.8.0","status":"affected","lessThanOrEqual":"8.8.0","versionType":"semver"},{"version":"8.7.1","status":"affected","lessThanOrEqual":"8.7.1","versionType":"semver"},{"version":"8.7.0","status":"affected","lessThanOrEqual":"8.7.0","versionType":"semver"},{"version":"8.6.0","status":"affected","lessThanOrEqual":"8.6.0","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.0","versionType":"semver"},{"version":"8.4.0","status":"affected","lessThanOrEqual":"8.4.0","versionType":"semver"},{"version":"8.3.0","status":"affected","lessThanOrEqual":"8.3.0","versionType":"semver"},{"version":"8.2.1","status":"affected","lessThanOrEqual":"8.2.1","versionType":"semver"},{"version":"8.2.0","status":"affected","lessThanOrEqual":"8.2.0","versionType":"semver"},{"version":"8.1.2","status":"affected","lessThanOrEqual":"8.1.2","versionType":"semver"},{"version":"8.1.1","status":"affected","lessThanOrEqual":"8.1.1","versionType":"semver"},{"version":"8.1.0","status":"affected","lessThanOrEqual":"8.1.0","versionType":"semver"},{"version":"8.0.1","status":"affected","lessThanOrEqual":"8.0.1","versionType":"semver"},{"version":"8.0.0","status":"affected","lessThanOrEqual":"8.0.0","versionType":"semver"},{"version":"7.88.1","status":"affected","lessThanOrEqual":"7.88.1","versionType":"semver"},{"version":"7.88.0","status":"affected","lessThanOrEqual":"7.88.0","versionType":"semver"},{"version":"7.87.0","status":"affected","lessThanOrEqual":"7.87.0","versionType":"semver"},{"version":"7.86.0","status":"affected","lessThanOrEqual":"7.86.0","versionType":"semver"},{"version":"7.85.0","status":"affected","lessThanOrEqual":"7.85.0","versionType":"semver"},{"version":"7.84.0","status":"affected","lessThanOrEqual":"7.84.0","versionType":"semver"},{"version":"7.83.1","status":"affected","lessThanOrEqual":"7.83.1","versionType":"semver"},{"version":"7.83.0","status":"affected","lessThanOrEqual":"7.83.0","versionType":"semver"},{"version":"7.82.0","status":"affected","lessThanOrEqual":"7.82.0","versionType":"semver"},{"version":"7.81.0","status":"affected","lessThanOrEqual":"7.81.0","versionType":"semver"},{"version":"7.80.0","status":"affected","lessThanOrEqual":"7.80.0","versionType":"semver"},{"version":"7.79.1","status":"affected","lessThanOrEqual":"7.79.1","versionType":"semver"},{"version":"7.79.0","status":"affected","lessThanOrEqual":"7.79.0","versionType":"semver"},{"version":"7.78.0","status":"affected","lessThanOrEqual":"7.78.0","versionType":"semver"},{"version":"7.77.0","status":"affected","lessThanOrEqual":"7.77.0","versionType":"semver"},{"version":"7.76.1","status":"affected","lessThanOrEqual":"7.76.1","versionType":"semver"},{"version":"7.76.0","status":"affected","lessThanOrEqual":"7.76.0","versionType":"semver"},{"version":"7.75.0","status":"affected","lessThanOrEqual":"7.75.0","versionType":"semver"},{"version":"7.74.0","status":"affected","lessThanOrEqual":"7.74.0","versionType":"semver"},{"version":"7.73.0","status":"affected","lessThanOrEqual":"7.73.0","versionType":"semver"},{"version":"7.72.0","status":"affected","lessThanOrEqual":"7.72.0","versionType":"semver"},{"version":"7.71.1","status":"affected","lessThanOrEqual":"7.71.1","versionType":"semver"},{"version":"7.71.0","status":"affected","lessThanOrEqual":"7.71.0","versionType":"semver"}],"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"}],"credits":[{"lang":"en","value":"Muhamad Arga Reksapati","type":"finder"},{"lang":"en","value":"Daniel Stenberg","type":"remediation developer"}]},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/04/29/13"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-05-13T09:05:37.539Z"}},{"references":[{"url":"https://hackerone.com/reports/3671818","tags":["exploit"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T17:24:29.094167Z","id":"CVE-2026-6276","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-13T17:26:06.894Z"}}]}}