{"id":"CVE-2026-8286","title":"A vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.","summary":"A vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-295"],"vendor":"haxx","product":"curl","affected":["curl >= 7.30.0, < 8.21.0"],"patched":["curl 8.21.0"],"published":"2026-07-03","updated":"2026-09-15","sourceUpdated":"2026-09-15T07:16:31.617","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-8286","references":[{"url":"https://curl.se/docs/CVE-2026-8286.html","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://curl.se/docs/CVE-2026-8286.json","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3718195","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3718195","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8286.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-8286"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2496763"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-8286"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8286"},{"url":"https://access.redhat.com/errata/RHSA-2026:60440"},{"url":"https://access.redhat.com/errata/RHSA-2026:55450"},{"url":"https://access.redhat.com/errata/RHSA-2026:55439"},{"url":"https://access.redhat.com/errata/RHSA-2026:57462"},{"url":"https://access.redhat.com/errata/RHSA-2026:63140"},{"url":"https://access.redhat.com/errata/RHSA-2026:63135"},{"url":"https://access.redhat.com/errata/RHSA-2026:63138"},{"url":"https://access.redhat.com/errata/RHSA-2026:61783"},{"url":"https://access.redhat.com/errata/RHSA-2026:29017"},{"url":"https://access.redhat.com/errata/RHSA-2026:34975"},{"url":"https://access.redhat.com/errata/RHSA-2026:56869"},{"url":"https://access.redhat.com/errata/RHSA-2026:62260"},{"url":"https://access.redhat.com/errata/RHSA-2026:58981"},{"url":"https://access.redhat.com/errata/RHSA-2026:66018"},{"url":"https://access.redhat.com/errata/RHSA-2026:66357"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-07-06T17:33:16.174641Z"},"epss":0.00309,"epssPercentile":0.23927,"ingestedAt":"2026-07-04T04:55:39.432Z","slug":"CVE-2026-8286","body":"## Overview\n\nA vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.\n\n## Affected\n\n- `curl >= 7.30.0, < 8.21.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 8.21.0`\n\n## Vendor advisories\n\n- **RHSA-2026:60440** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:60440)\n- **RHSA-2026:55450** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55450)\n- **RHSA-2026:55439** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55439)\n- **RHSA-2026:57462** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57462)\n- **RHSA-2026:63140** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63140)\n- **RHSA-2026:63135** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63135)\n- **RHSA-2026:63138** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63138)\n- **RHSA-2026:61783** · Red Hat · fixed in: Red Hat Discovery 2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61783)\n- **RHSA-2026:29017** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-06-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:29017)\n- **RHSA-2026:34975** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:34975)\n- **RHSA-2026:56869** · Red Hat · fixed in: Red Hat JBoss Core Services 2.4.62.SP5 · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56869)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8286.json)\n- **RHSA-2026:66357** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66357)","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":203488,"id":"CVE-2026-8286","ts":1789457645743,"field":"exploit_available","old":"false","new":"true"},{"seq":202012,"id":"CVE-2026-8286","ts":1789400008715,"field":"cvss","old":null,"new":"8.1"},{"seq":202011,"id":"CVE-2026-8286","ts":1789400008715,"field":"severity","old":"none","new":"high"},{"seq":200739,"id":"CVE-2026-8286","ts":1789397601475,"field":"cvss","old":"8.1","new":null},{"seq":200738,"id":"CVE-2026-8286","ts":1789397601475,"field":"severity","old":"high","new":"none"},{"seq":199434,"id":"CVE-2026-8286","ts":1789395508156,"field":"cvss","old":null,"new":"8.1"},{"seq":199433,"id":"CVE-2026-8286","ts":1789395508156,"field":"severity","old":"none","new":"high"},{"seq":198679,"id":"CVE-2026-8286","ts":1789392200283,"field":"cvss","old":"8.1","new":null},{"seq":198678,"id":"CVE-2026-8286","ts":1789392200283,"field":"severity","old":"high","new":"none"},{"seq":197012,"id":"CVE-2026-8286","ts":1789384287402,"field":"cvss","old":null,"new":"8.1"},{"seq":197011,"id":"CVE-2026-8286","ts":1789384287402,"field":"severity","old":"none","new":"high"},{"seq":196370,"id":"CVE-2026-8286","ts":1789383753692,"field":"cvss","old":"8.1","new":null},{"seq":196369,"id":"CVE-2026-8286","ts":1789383753692,"field":"severity","old":"high","new":"none"},{"seq":195298,"id":"CVE-2026-8286","ts":1789380565531,"field":"cvss","old":null,"new":"8.1"},{"seq":195297,"id":"CVE-2026-8286","ts":1789380565531,"field":"severity","old":"none","new":"high"},{"seq":194141,"id":"CVE-2026-8286","ts":1789378753749,"field":"cvss","old":"8.1","new":null},{"seq":194140,"id":"CVE-2026-8286","ts":1789378753749,"field":"severity","old":"high","new":"none"},{"seq":192928,"id":"CVE-2026-8286","ts":1789376504865,"field":"cvss","old":null,"new":"8.1"},{"seq":192927,"id":"CVE-2026-8286","ts":1789376504865,"field":"severity","old":"none","new":"high"},{"seq":191715,"id":"CVE-2026-8286","ts":1789373609048,"field":"cvss","old":"8.1","new":null},{"seq":191714,"id":"CVE-2026-8286","ts":1789373609048,"field":"severity","old":"high","new":"none"},{"seq":190500,"id":"CVE-2026-8286","ts":1789369460592,"field":"cvss","old":null,"new":"8.1"},{"seq":190499,"id":"CVE-2026-8286","ts":1789369460592,"field":"severity","old":"none","new":"high"},{"seq":189287,"id":"CVE-2026-8286","ts":1789368387721,"field":"cvss","old":"8.1","new":null},{"seq":189286,"id":"CVE-2026-8286","ts":1789368387721,"field":"severity","old":"high","new":"none"},{"seq":188070,"id":"CVE-2026-8286","ts":1789365225419,"field":"cvss","old":null,"new":"8.1"},{"seq":188069,"id":"CVE-2026-8286","ts":1789365225419,"field":"severity","old":"none","new":"high"},{"seq":186857,"id":"CVE-2026-8286","ts":1789363465027,"field":"cvss","old":"8.1","new":null},{"seq":186856,"id":"CVE-2026-8286","ts":1789363465027,"field":"severity","old":"high","new":"none"},{"seq":185643,"id":"CVE-2026-8286","ts":1789361213087,"field":"cvss","old":null,"new":"8.1"},{"seq":185642,"id":"CVE-2026-8286","ts":1789361213087,"field":"severity","old":"none","new":"high"},{"seq":184430,"id":"CVE-2026-8286","ts":1789358339790,"field":"cvss","old":"8.1","new":null},{"seq":184429,"id":"CVE-2026-8286","ts":1789358339790,"field":"severity","old":"high","new":"none"},{"seq":182681,"id":"CVE-2026-8286","ts":1789354311401,"field":"cvss","old":null,"new":"8.1"},{"seq":182680,"id":"CVE-2026-8286","ts":1789354311401,"field":"severity","old":"none","new":"high"},{"seq":181474,"id":"CVE-2026-8286","ts":1789353309789,"field":"cvss","old":"8.1","new":null},{"seq":181473,"id":"CVE-2026-8286","ts":1789353309789,"field":"severity","old":"high","new":"none"},{"seq":180267,"id":"CVE-2026-8286","ts":1789350273826,"field":"cvss","old":null,"new":"8.1"},{"seq":180266,"id":"CVE-2026-8286","ts":1789350273826,"field":"severity","old":"none","new":"high"},{"seq":179060,"id":"CVE-2026-8286","ts":1789348270739,"field":"cvss","old":"8.1","new":null},{"seq":179059,"id":"CVE-2026-8286","ts":1789348270739,"field":"severity","old":"high","new":"none"},{"seq":177853,"id":"CVE-2026-8286","ts":1789346363415,"field":"cvss","old":null,"new":"8.1"},{"seq":177852,"id":"CVE-2026-8286","ts":1789346363415,"field":"severity","old":"none","new":"high"},{"seq":176646,"id":"CVE-2026-8286","ts":1789343169927,"field":"cvss","old":"8.1","new":null},{"seq":176645,"id":"CVE-2026-8286","ts":1789343169927,"field":"severity","old":"high","new":"none"},{"seq":174763,"id":"CVE-2026-8286","ts":1789334870655,"field":"cvss","old":null,"new":"8.1"},{"seq":174762,"id":"CVE-2026-8286","ts":1789334870655,"field":"severity","old":"none","new":"high"},{"seq":173558,"id":"CVE-2026-8286","ts":1789333672551,"field":"cvss","old":"8.1","new":null},{"seq":173557,"id":"CVE-2026-8286","ts":1789333672551,"field":"severity","old":"high","new":"none"},{"seq":172372,"id":"CVE-2026-8286","ts":1789331087556,"field":"cvs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