{"id":"CVE-2026-80255","title":"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","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-201"],"vendor":"haxx","product":"curl","affected":["curl >= 8.13.0, < 8.22.0"],"patched":["curl 8.22.0"],"published":"2026-09-06","updated":"2026-09-15","sourceUpdated":"2026-09-15T07:16:30.770","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80255","references":[{"url":"https://curl.se/docs/CVE-2026-80255.html","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://curl.se/docs/CVE-2026-80255.json","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3972395","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3972395","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-08T18:45:09.883106Z"},"epss":0.00684,"epssPercentile":0.50739,"ingestedAt":"2026-09-07T11:09:35.679Z","slug":"CVE-2026-80255","body":"## Overview\n\nA `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.\n\n## Affected\n\n- `curl >= 8.13.0, < 8.22.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 8.22.0`","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":8241,"id":"CVE-2026-80255","ts":1788919993812,"field":"exploit_available","old":"false","new":"true"},{"seq":8240,"id":"CVE-2026-80255","ts":1788919993812,"field":"cvss","old":null,"new":"7.5"},{"seq":8239,"id":"CVE-2026-80255","ts":1788919993812,"field":"severity","old":"none","new":"high"},{"seq":8050,"id":"CVE-2026-80255","ts":1788919280794,"field":"exploit_available","old":"true","new":"false"},{"seq":8049,"id":"CVE-2026-80255","ts":1788919280794,"field":"cvss","old":"7.5","new":null},{"seq":8048,"id":"CVE-2026-80255","ts":1788919280794,"field":"severity","old":"high","new":"none"},{"seq":7859,"id":"CVE-2026-80255","ts":1788916354430,"field":"exploit_available","old":"false","new":"true"},{"seq":7858,"id":"CVE-2026-80255","ts":1788916354430,"field":"cvss","old":null,"new":"7.5"},{"seq":7857,"id":"CVE-2026-80255","ts":1788916354430,"field":"severity","old":"none","new":"high"},{"seq":7668,"id":"CVE-2026-80255","ts":1788915297496,"field":"exploit_available","old":"true","new":"false"},{"seq":7667,"id":"CVE-2026-80255","ts":1788915297496,"field":"cvss","old":"7.5","new":null},{"seq":7666,"id":"CVE-2026-80255","ts":1788915297496,"field":"severity","old":"high","new":"none"},{"seq":7477,"id":"CVE-2026-80255","ts":1788912713872,"field":"exploit_available","old":"false","new":"true"},{"seq":7476,"id":"CVE-2026-80255","ts":1788912713872,"field":"cvss","old":null,"new":"7.5"},{"seq":7475,"id":"CVE-2026-80255","ts":1788912713872,"field":"severity","old":"none","new":"high"},{"seq":7286,"id":"CVE-2026-80255","ts":1788911331424,"field":"exploit_available","old":"true","new":"false"},{"seq":7285,"id":"CVE-2026-80255","ts":1788911331424,"field":"cvss","old":"7.5","new":null},{"seq":7284,"id":"CVE-2026-80255","ts":1788911331424,"field":"severity","old":"high","new":"none"},{"seq":7090,"id":"CVE-2026-80255","ts":1788909077110,"field":"exploit_available","old":"false","new":"true"},{"seq":7089,"id":"CVE-2026-80255","ts":1788909077110,"field":"cvss","old":null,"new":"7.5"},{"seq":7088,"id":"CVE-2026-80255","ts":1788909077110,"field":"severity","old":"none","new":"high"},{"seq":6902,"id":"CVE-2026-80255","ts":1788907391528,"field":"exploit_available","old":"true","new":"false"},{"seq":6901,"id":"CVE-2026-80255","ts":1788907391528,"field":"cvss","old":"7.5","new":null},{"seq":6900,"id":"CVE-2026-80255","ts":1788907391528,"field":"severity","old":"high","new":"none"},{"seq":6704,"id":"CVE-2026-80255","ts":1788905443447,"field":"exploit_available","old":"false","new":"true"},{"seq":6703,"id":"CVE-2026-80255","ts":1788905443447,"field":"cvss","old":null,"new":"7.5"},{"seq":6702,"id":"CVE-2026-80255","ts":1788905443447,"field":"severity","old":"none","new":"high"},{"seq":6522,"id":"CVE-2026-80255","ts":1788903459752,"field":"exploit_available","old":"true","new":"false"},{"seq":6521,"id":"CVE-2026-80255","ts":1788903459752,"field":"cvss","old":"7.5","new":null},{"seq":6520,"id":"CVE-2026-80255","ts":1788903459752,"field":"severity","old":"high","new":"none"},{"seq":6309,"id":"CVE-2026-80255","ts":1788901810243,"field":"exploit_available","old":"false","new":"true"},{"seq":6308,"id":"CVE-2026-80255","ts":1788901810243,"field":"cvss","old":null,"new":"7.5"},{"seq":6307,"id":"CVE-2026-80255","ts":1788901810243,"field":"severity","old":"none","new":"high"},{"seq":6139,"id":"CVE-2026-80255","ts":1788899562174,"field":"exploit_available","old":"true","new":"false"},{"seq":6138,"id":"CVE-2026-80255","ts":1788899562174,"field":"cvss","old":"7.5","new":null},{"seq":6137,"id":"CVE-2026-80255","ts":1788899562174,"field":"severity","old":"high","new":"none"},{"seq":5942,"id":"CVE-2026-80255","ts":1788898179487,"field":"exploit_available","old":"false","new":"true"},{"seq":5941,"id":"CVE-2026-80255","ts":1788898179487,"field":"cvss","old":null,"new":"7.5"},{"seq":5940,"id":"CVE-2026-80255","ts":1788898179487,"field":"severity","old":"none","new":"high"},{"seq":5831,"id":"CVE-2026-80255","ts":1788895711188,"field":"exploit_available","old":"true","new":"false"},{"seq":5830,"id":"CVE-2026-80255","ts":1788895711188,"field":"cvss","old":"7.5","new":null},{"seq":5829,"id":"CVE-2026-80255","ts":1788895711188,"field":"severity","old":"high","new":"none"},{"seq":5749,"id":"CVE-2026-80255","ts":1788894572826,"field":"exploit_available","old":"false","new":"true"},{"seq":5748,"id":"CVE-2026-80255","ts":1788894572826,"field":"cvss","old":null,"new":"7.5"},{"seq":5747,"id":"CVE-2026-80255","ts":1788894572826,"field":"severity","old":"none","new":"high"}]}