{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80255","assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","state":"PUBLISHED","assignerShortName":"curl","dateReserved":"2026-08-26T06:25:58.220Z","datePublished":"2026-09-06T17:48:54.275Z","dateUpdated":"2026-09-15T06:03:13.400Z"},"containers":{"cna":{"providerMetadata":{"orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl","dateUpdated":"2026-09-15T06:03:13.400Z"},"title":"secure cookie attribute bypass with tab","descriptions":[{"lang":"en","value":"A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\nstore the cookie without its Secure flag. The cookie might then wrongfully be\nsent over plaintext HTTP on subsequent requests to the same host."}],"affected":[{"vendor":"curl","product":"curl","versions":[{"version":"8.13.0","status":"affected","versionType":"semver","lessThan":"8.14.2"},{"version":"8.15.0","status":"affected","versionType":"semver","lessThan":"8.16.1"},{"version":"8.17.0","status":"affected","versionType":"semver","lessThan":"8.20.1"},{"version":"8.21.0","status":"affected","versionType":"semver","lessThan":"8.22.0"}],"defaultStatus":"unaffected"},{"vendor":"curl","product":"curl","versions":[{"version":"1aea05a6c2699e80c75936d58569851555acd603","status":"affected","versionType":"git","lessThan":"4f6aa41a0145e930e766775dbe860883d350aa0a"}],"defaultStatus":"unaffected","repo":"https://github.com/curl/curl.git"},{"vendor":"curl","product":"curl","versions":[{"version":"8.21.0","status":"affected"},{"version":"8.20.0","status":"affected"},{"version":"8.19.0","status":"affected"},{"version":"8.18.0","status":"affected"},{"version":"8.17.0","status":"affected"},{"version":"8.16.0","status":"affected"},{"version":"8.15.0","status":"affected"},{"version":"8.14.1","status":"affected"},{"version":"8.14.0","status":"affected"},{"version":"8.13.0","status":"affected"}],"defaultStatus":"unaffected"}],"references":[{"url":"https://curl.se/docs/CVE-2026-80255.json"},{"url":"https://curl.se/docs/CVE-2026-80255.html"},{"url":"https://hackerone.com/reports/3972395"}],"x_osv":{"schema_version":"1.5.0","id":"CURL-CVE-2026-80255","aliases":["CVE-2026-80255"],"summary":"secure cookie attribute bypass with tab","modified":"2026-09-07T10:34:51.00Z","database_specific":{"package":"curl","affects":"both","URL":"https://curl.se/docs/CVE-2026-80255.json","www":"https://curl.se/docs/CVE-2026-80255.html","issue":"https://hackerone.com/reports/3972395","CWE":{"id":"CWE-201","desc":"Information Exposure Through Sent Data"},"last_affected":"8.21.0","severity":"Low"},"published":"2026-09-02T08:00:00.00Z","affected":[{"ranges":[{"type":"SEMVER","events":[{"introduced":"8.13.0"},{"fixed":"8.14.2"},{"introduced":"8.15.0"},{"fixed":"8.16.1"},{"introduced":"8.17.0"},{"fixed":"8.20.1"},{"introduced":"8.21.0"},{"fixed":"8.22.0"}]},{"type":"GIT","repo":"https://github.com/curl/curl.git","events":[{"introduced":"1aea05a6c2699e80c75936d58569851555acd603"},{"fixed":"4f6aa41a0145e930e766775dbe860883d350aa0a"}]}],"versions":["8.21.0","8.20.0","8.19.0","8.18.0","8.17.0","8.16.0","8.15.0","8.14.1","8.14.0","8.13.0"]}],"credits":[{"name":"Stanislav Fort (Aisle Research)","type":"finder"},{"name":"Daniel Stenberg","type":"remediation developer"}],"details":"A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\nstore the cookie without its Secure flag. The cookie might then wrongfully be\nsent over plaintext HTTP on subsequent requests to the same host."},"problemTypes":[{"descriptions":[{"lang":"en","description":"Information Exposure Through Sent Data","cweId":"CWE-201","type":"CWE"}]}],"credits":[{"lang":"en","value":"Stanislav Fort (Aisle Research)","type":"finder"},{"lang":"en","value":"Daniel Stenberg","type":"remediation developer"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-201","lang":"en","description":"CWE-201 Insertion of Sensitive Information Into Sent Data"}]}],"references":[{"url":"https://hackerone.com/reports/3972395","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:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-08T18:45:09.883106Z","id":"CVE-2026-80255","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":"2026-09-08T18:45:49.180Z"}}]}}