CVE-2026-8286

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://curl.se/docs/CVE-2026-8286.html	Patch Vendor Advisory
https://curl.se/docs/CVE-2026-8286.json	Vendor Advisory
https://hackerone.com/reports/3718195	Exploit Issue Tracking Third Party Advisory
https://hackerone.com/reports/3718195	Exploit Issue Tracking Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

History

07 Jul 2026, 19:42

Type	Values Removed	Values Added
CWE		CWE-295
References	~~() https://curl.se/docs/CVE-2026-8286.html -~~	() https://curl.se/docs/CVE-2026-8286.html - Patch, Vendor Advisory
References	~~() https://curl.se/docs/CVE-2026-8286.json -~~	() https://curl.se/docs/CVE-2026-8286.json - Vendor Advisory
References	~~() https://hackerone.com/reports/3718195 -~~	() https://hackerone.com/reports/3718195 - Exploit, Issue Tracking, Third Party Advisory
CPE		cpe:2.3:a:haxx:curl::::::::
First Time		Haxx curl Haxx

06 Jul 2026, 18:16

Type	Values Removed	Values Added
References	~~() https://hackerone.com/reports/3718195 -~~	() https://hackerone.com/reports/3718195 -
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.1

03 Jul 2026, 07:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-03 07:16

Updated : 2026-07-07 19:42

NVD link : CVE-2026-8286

Mitre link : CVE-2026-8286

CVE.ORG link : CVE-2026-8286

JSON object : View

Products Affected

haxx

curl

CWE

CWE-295

Improper Certificate Validation

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"lessThanOrEqual": "7.32.0"}, {"status": "affected", "version": "7.31.0", "versionType": "semver", "lessThanOrEqual": "7.31.0"}, {"status": "affected", "version": "7.30.0", "versionType": "semver", "lessThanOrEqual": "7.30.0"}], "defaultStatus": "unaffected"}]}], "published": "2026-07-03T07:16:24.453", "references": [{"url": "https://curl.se/docs/CVE-2026-8286.html", "tags": ["Patch", "Vendor Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://curl.se/docs/CVE-2026-8286.json", "tags": ["Vendor Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/3718195", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "2499f714-1537-4658-8207-48ae4bb9eae9"}, {"url": "https://hackerone.com/reports/3718195", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-295"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-07-07T19:42:11.240", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "248C6E85-F6A2-4E75-8D49-D00FEB938FAE", "versionEndExcluding": "8.21.0", "versionStartIncluding": "7.30.0"}], "operator": "OR"}]}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9"}