CVE-2026-8286

8.1 HIGH 0.3% exploit odds Fix listed Crypto

What it is

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.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-07-03 07:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-09-15 07:16 UTC Last updatedMost recent change to the record

Details

Published: 2026-07-03 07:16 UTC
Last modified: 2026-09-15 07:16 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-295 · Improper certificate validation
Record status: Modified

Affected

Haxx Curl < 8.21.0

Attack profile CVSS 3.1 · 8.1

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Download Square Reddit

Fix and advisories

References

NVD record · CVE.org record