CVE-2026-8286
HIGHCVSS 8.1/10EPSS 0.31%
Last modified
CVE-2026-8286 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.30.0, < 8.21.0 |
References
- https://curl.se/docs/CVE-2026-8286.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-8286.jsonVendor Advisory
- https://hackerone.com/reports/3718195Exploit, Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/3718195Exploit, Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2026-8286?
CVE-2026-8286 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-8286?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-8286?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST