CVE-2026-86415
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductCurl
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-201CWE-201
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| curl curl | 8.22.0, 8.21.0 | — |
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