{“lastseen”:””,”description”:”libcurl might in some circumstances reuse the wrong connection when asked to\\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\\nboth use the same host.\\n\\nlibcurl features a pool of recent connections so that subsequent requests can\\nreuse an existing connection to avoid overhead.\\n\\nWhen reusing a connection a range of criteria must be met. Due to a logical\\nerror in the code, a request that was issued by an application could\\nwrongfully reuse an existing connection to the same server that was\\nauthenticated using different credentials.\\n\\nAn application that first uses Negotiate authentication to a server with\\n`user1:password1` and then does another operation to the same server asking\\nfor any authentication method but for `user2:password2` (while the previous\\nconnection is still alive) – the second request gets confused and wrongly\\nreuses the same connection and sends the new request over that connection\\nthinking it uses a mix of user1’s and user2’s credentials when it is in fact\\nstill using the connection authenticated for user1…”,”published”:”2026-05-13T08:27:26.065Z”,”modified”:”2026-05-13T17:46:40.830Z”,”type”:”cve”,”title”:”wrong reuse of HTTP Negotiate connection”,”source”:”curl”,”references”:”https:\/\/curl.se\/docs\/CVE-2026-5545.json\\nhttps:\/\/curl.se\/docs\/CVE-2026-5545.html\\nhttps:\/\/hackerone.com\/reports\/3642555″,”id”:”CVE-2026-5545″,”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\\ncurl curl 7.70.0\\ncurl curl 7.69.1\\ncurl curl 7.69.0\\ncurl curl 7.68.0\\ncurl curl 7.67.0\\ncurl curl 7.66.0\\ncurl curl 7.65.3\\ncurl curl 7.65.2\\ncurl curl 7.65.1\\ncurl curl 7.65.0\\ncurl curl 7.64.1\\ncurl curl 7.64.0\\ncurl curl 7.63.0\\ncurl curl 7.62.0\\ncurl curl 7.61.1\\ncurl curl 7.61.0\\ncurl curl 7.60.0\\ncurl curl 7.59.0\\ncurl curl 7.58.0\\ncurl curl 7.57.0\\ncurl curl 7.56.1\\ncurl curl 7.56.0\\ncurl curl 7.55.1\\ncurl curl 7.55.0\\ncurl curl 7.54.1\\ncurl curl 7.54.0\\ncurl curl 7.53.1\\ncurl curl 7.53.0\\ncurl curl 7.52.1\\ncurl curl 7.52.0\\ncurl curl 7.51.0\\ncurl curl 7.50.3\\ncurl curl 7.50.2\\ncurl curl 7.50.1\\ncurl curl 7.50.0\\ncurl curl 7.49.1\\ncurl curl 7.49.0\\ncurl curl 7.48.0\\ncurl curl 7.47.1\\ncurl curl 7.47.0\\ncurl curl 7.46.0\\ncurl curl 7.45.0\\ncurl curl 7.44.0\\ncurl curl 7.43.0\\ncurl curl 7.42.1\\ncurl curl 7.42.0\\ncurl curl 7.41.0\\ncurl curl 7.40.0\\ncurl curl 7.39.0\\ncurl curl 7.38.0\\ncurl curl 7.37.1\\ncurl curl 7.37.0\\ncurl curl 7.36.0\\ncurl curl 7.35.0\\ncurl curl 7.34.0\\ncurl curl 7.33.0\\ncurl curl 7.32.0\\ncurl curl 7.31.0\\ncurl curl 7.30.0\\ncurl curl 7.29.0\\ncurl curl 7.28.1\\ncurl curl 7.28.0\\ncurl curl 7.27.0\\ncurl curl 7.26.0\\ncurl curl 7.25.0\\ncurl curl 7.24.0\\ncurl curl 7.23.1\\ncurl curl 7.23.0\\ncurl curl 7.22.0\\ncurl curl 7.21.7\\ncurl curl 7.21.6\\ncurl curl 7.21.5\\ncurl curl 7.21.4\\ncurl curl 7.21.3\\ncurl curl 7.21.2\\ncurl curl 7.21.1\\ncurl curl 7.21.0\\ncurl curl 7.20.1\\ncurl curl 7.20.0\\ncurl curl 7.19.7\\ncurl curl 7.19.6\\ncurl curl 7.19.5\\ncurl curl 7.19.4\\ncurl curl 7.19.3\\ncurl curl 7.19.2\\ncurl curl 7.19.1\\ncurl curl 7.19.0\\ncurl curl 7.18.2\\ncurl curl 7.18.1\\ncurl curl 7.18.0\\ncurl curl 7.17.1\\ncurl curl 7.17.0\\ncurl curl 7.16.4\\ncurl curl 7.16.3\\ncurl curl 7.16.2\\ncurl curl 7.16.1\\ncurl curl 7.16.0\\ncurl curl 7.15.5\\ncurl curl 7.15.4\\ncurl curl 7.15.3\\ncurl curl 7.15.2\\ncurl curl 7.15.1\\ncurl curl 7.15.0\\ncurl curl 7.14.1\\ncurl curl 7.14.0\\ncurl curl 7.13.2\\ncurl curl 7.13.1\\ncurl curl 7.13.0\\ncurl curl 7.12.3\\ncurl curl 7.12.2\\ncurl curl 7.12.1\\ncurl curl 7.12.0\\ncurl curl 7.11.2\\ncurl curl 7.11.1\\ncurl curl 7.11.0\\ncurl curl 7.10.8\\ncurl curl 7.10.7\\ncurl curl 7.10.6″,”sourceHref”:””,”cvss”:{“score”:6.5,”severity”:”MEDIUM”,”vector”:”CVSS:3.1\/AV:N\/AC:H\/PR:N\/UI:N\/S:U\/C:L\/I:H\/A:N”,”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”:”libcurl might in some circumstances reuse the wrong connection when asked to\\ndo an authenticated HTTP(S) request after a Negotiate-authenticated one, when\\nboth use the same host.\\n\\nlibcurl…<\/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":[6,8,26,12,21,13,7,11,5],"class_list":["post-54204","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-65","tag-exploit","tag-medium","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n