{“lastseen”:””,”description”:”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.”,”published”:”2026-05-13T08:28:19.273Z”,”modified”:”2026-05-13T17:26:06.894Z”,”type”:”cve”,”title”:”stale custom cookie host causes cookie leak”,”source”:”curl”,”references”:”https:\/\/curl.se\/docs\/CVE-2026-6276.json\\nhttps:\/\/curl.se\/docs\/CVE-2026-6276.html\\nhttps:\/\/hackerone.com\/reports\/3671818″,”id”:”CVE-2026-6276″,”bulletinFamily”:””,”cwe”:null,”cvelist”:null,”sourceData”:”curl curl 8.19.0\\ncurl curl 8.18.0\\ncurl curl 8.17.0\\ncurl curl 8.16.0\\ncurl curl 8.15.0\\ncurl curl 8.14.1\\ncurl curl 8.14.0\\ncurl curl 8.13.0\\ncurl curl 8.12.1\\ncurl curl 8.12.0\\ncurl curl 8.11.1\\ncurl curl 8.11.0\\ncurl curl 8.10.1\\ncurl curl 8.10.0\\ncurl curl 8.9.1\\ncurl curl 8.9.0\\ncurl curl 8.8.0\\ncurl curl 8.7.1\\ncurl curl 8.7.0\\ncurl curl 8.6.0\\ncurl curl 8.5.0\\ncurl curl 8.4.0\\ncurl curl 8.3.0\\ncurl curl 8.2.1\\ncurl curl 8.2.0\\ncurl curl 8.1.2\\ncurl curl 8.1.1\\ncurl curl 8.1.0\\ncurl curl 8.0.1\\ncurl curl 8.0.0\\ncurl curl 7.88.1\\ncurl curl 7.88.0\\ncurl curl 7.87.0\\ncurl curl 7.86.0\\ncurl curl 7.85.0\\ncurl curl 7.84.0\\ncurl curl 7.83.1\\ncurl curl 7.83.0\\ncurl curl 7.82.0\\ncurl curl 7.81.0\\ncurl curl 7.80.0\\ncurl curl 7.79.1\\ncurl curl 7.79.0\\ncurl curl 7.78.0\\ncurl curl 7.77.0\\ncurl curl 7.76.1\\ncurl curl 7.76.0\\ncurl curl 7.75.0\\ncurl curl 7.74.0\\ncurl curl 7.73.0\\ncurl curl 7.72.0\\ncurl curl 7.71.1\\ncurl curl 7.71.0″,”sourceHref”:””,”cvss”:{“score”:7.5,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:N\/AC:L\/PR:N\/UI:N\/S:U\/C:N\/I:N\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”curl”,”version”:”8.19.0″,”vendor”:”curl”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"
{“lastseen”:””,”description”:”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*…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,16,12,15,13,7,11,5],"class_list":["post-54207","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-75","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n