{"id":"CVE-2026-86415","aliases":["ALPINE-CVE-2026-86415","BELL-CVE-2026-86415","CURL-CVE-2026-86415","DEBIAN-CVE-2026-86415","EUVD-2026-105307","GHSA-4g5c-8qrq-wcmw","MGASA-2026-0515"],"status":"published","title":"auto client cert connection reuse mixup","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.00419,"percentile":0.36732,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-201"],"published":"2026-10-14T08:00:00Z","modified":"2026-11-02T07:15:05Z","fixes":[{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["8.23.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["8.23.0-r0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.23","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.23.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.23.0-r0"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.14.1-2","8.14.1-2+exp1","8.15.0-1","8.15.0-1~bpo13+1","8.15.0-1~exp1","8.15.0~rc1-1exp1","8.15.0~rc2-1~exp1","8.15.0~rc3-1~exp1","8.16.0-1","8.16.0-1+exp1","8.16.0-1~bpo13+1","8.16.0-2","8.16.0-3","8.16.0-4","8.16.0-4~bpo13+1","8.16.0~rc1-1~exp1","8.16.0~rc2-1","8.16.0~rc2-2","8.16.0~rc3-1","8.17.0-1","8.17.0-2","8.17.0-3","8.17.0~rc1-1~exp1","8.17.0~rc2-1","8.17.0~rc3-1","8.18.0-1","8.18.0-1~bpo13+1","8.18.0-2","8.18.0~rc1-1+exp1","8.18.0~rc2-1","8.18.0~rc3-1","8.19.0-1","8.19.0-1+exp1","8.19.0-1~bpo13+1","8.19.0-2","8.19.0-3","8.19.0-3+exp1","8.19.0-3+exp2","8.19.0~rc1-1~exp1","8.19.0~rc2-1","8.19.0~rc2-2","8.19.0~rc3-1","8.20.0-1","8.20.0-1+exp","8.20.0-2","8.20.0-2+exp1","8.20.0-2~bpo13+1","8.20.0-3","8.20.0-4","8.20.0-5","8.20.0-5~bpo13+1","8.20.0~rc1-1+exp1","8.20.0~rc1-1+exp2","8.20.0~rc1-1+exp3","8.20.0~rc2-1","8.20.0~rc2-1+exp1","8.20.0~rc3-1","8.20.0~rc3-1+exp1","8.21.0-1","8.21.0-1+exp1","8.21.0-2","8.21.0-2+exp1","8.21.0-2~bpo13+1","8.21.0~rc1-1+exp1","8.21.0~rc2-1","8.21.0~rc2-1+exp1","8.21.0~rc3-1","8.21.0~rc3-1+exp1","8.22.0-1","8.22.0-1+exp1","8.22.0~rc2-1","8.22.0~rc2-2","8.22.0~rc3-1","8.22.0~rc3-1+exp1","8.23.0-1","8.23.0~rc1-1","8.23.0~rc1-2","8.23.0~rc2-1","8.23.0~rc2-1+exp1","8.23.0~rc3-1","8.23.0~rc3-1+exp1"]},{"source":"osv","ecosystem":"Mageia:10","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.23.0-1.mga10"}]}],"bundled":31}],"products":[{"vendor":"curl","product":"curl"}],"references":[{"url":"https://curl.se/docs/CVE-2026-86415.json"},{"url":"https://curl.se/docs/CVE-2026-86415.html"},{"url":"https://hackerone.com/reports/3993870"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86415"},{"url":"https://github.com/advisories/GHSA-4g5c-8qrq-wcmw"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-86415","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-86415","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-86415","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0515.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=36250","tags":["report"]},{"url":"https://curl.se/docs/security.html","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-86415","title":"auto client cert connection reuse mixup","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","status":"published","published":"2026-10-20T20:08:29.941Z","modified":"2026-10-30T11:51:14.723Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-201"],"updated_at":"2026-11-02T13:49:31.546614Z"}],"euvd":[{"id":"EUVD-2026-105307","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","status":"published","published":"2026-10-20T20:08:29Z","modified":"2026-10-30T11:51:14Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:59:13.084737Z"}],"ghsa":[{"id":"GHSA-4g5c-8qrq-wcmw","title":"libcurl's connection cache match function never considers the automatic client\ncertificate option...","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","status":"published","published":"2026-10-20T21:31:07Z","modified":"2026-10-30T12:31:13Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-201"],"updated_at":"2026-11-02T15:14:41.74258Z"}],"nvd":[{"id":"CVE-2026-86415","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","status":"published","published":"2026-10-20T21:17:20.067Z","modified":"2026-10-30T12:16:45.447Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-201"],"updated_at":"2026-11-02T14:13:01.161484Z"}],"osv":[{"id":"ALPINE-CVE-2026-86415","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","status":"published","published":"2026-10-20T21:17:20.067Z","modified":"2026-10-31T09:30:02.519989406Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:27:50.764331Z"},{"id":"BELL-CVE-2026-86415","title":"CVE-2026-86415 does not affect BellSoft software","status":"withdrawn","published":"2026-10-17T06:05:39.706968Z","modified":"2026-11-02T07:15:05.710446553Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:26.630331Z"},{"id":"DEBIAN-CVE-2026-86415","description":"libcurl's connection cache match function never considers the automatic client certificate option, so a cached, already authenticated Schannel connection can be handed to a transfer that got redirected to a different origin, even though the code explicitly switched off the auto client cert option for that transfer to prevent exactly this.","status":"published","published":"2026-10-20T21:17:20.067Z","modified":"2026-10-31T10:02:06.802131032Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:46:05.022702Z"},{"id":"CURL-CVE-2026-86415","title":"auto client cert connection reuse mixup","description":"libcurl's connection cache match function never considers the automatic client\ncertificate option, so a cached, already authenticated Schannel connection can\nbe handed to a transfer that got redirected to a different origin, even though\nthe code explicitly switched off the auto client cert option for that transfer\nto prevent exactly this.","status":"published","published":"2026-10-14T08:00:00Z","modified":"2026-10-25T01:05:10.211891833Z","updated_at":"2026-11-02T15:43:55.998148Z"},{"id":"MGASA-2026-0515","title":"Updated curl package fixes security vulnerabilities","description":"curl 8.23.0 has been released. It fixes 24 CVEs since 8.22.0, listed at\nhttps://curl.se/docs/security.html\nNot all of theses CVEs affect Mageia. Of the ones fixed in 8.23.0, these\nare the ones that do:\nCVE-2026-86410: redirect to SFTP or SCP bypasses host verification\nCVE-2026-86412: server-set cookie erases cookie jar\nCVE-2026-86413: Negotiate credentials sent to redirected origin\nCVE-2026-86414: leaking host credentials to HTTP proxy\nCVE-2026-86415: auto client cert connection reuse mixup\nCVE-2026-87861: cross-origin reuse of a Negotiate connection\nCVE-2026-87862: HSTS cache import drops longer-lived child\nCVE-2026-87863: HSTS response erases persisted entries\nCVE-2026-92386: server-set cookie aborts cookie jar load\nCVE-2026-92387: never-ending loop via server response omission\nCVE-2026-92388: FTP wildcard write callback mixup\nCVE-2026-92389: TFTP direction confusion\nCVE-2026-92390: -J no-clobber guarantee bypassed with 103 early hints\nCVE-2026-92391: curl_mime_free stack overflow by recursion\nCVE-2026-92392: HTTP/2 upload Use-After-Free\nCVE-2026-94265: Authorization: Negotiate sent to foreign origin\nCVE-2026-94266: password leak in CURLINFO_EFFECTIVE_URL\nCVE-2026-107929: local interface connection reuse mixup\nThere were also some CVE IDs released at the same time that were fixed\nearlier, in 8.22.0, but just announced now:\nCVE-2026-86409: stale SigV4 headers sent unintended\nCVE-2026-86411: FTP connection reuse inherits client-certificate\nCVE-2026-87864: IMAP APPEND plus CRLF conversion command injection\nHere are the CVEs fixed in 8.22.0, which wasn't released in mga10 and so\nare only getting fixed now:\nCVE-2026-13608: OpenLDAP SASL authentication bypass\nCVE-2026-18924: HTTP/2 server push UAF\nCVE-2026-19931: Negotiate ambient user conn reuse\nCVE-2026-80229: OpenSSL provider use-after-free\nCVE-2026-80230: OpenSSL pinning bypass\nCVE-2026-80255: secure cookie attribute bypass with tab\nCVE-2026-82209: domain-scoped PSL domain cookie\n","status":"published","published":"2026-10-17T03:21:49Z","modified":"2026-10-17T03:43:01.411193688Z","updated_at":"2026-11-02T15:49:43.795591Z"}]}}