auto client cert connection reuse mixup
Summary
| CVE | CVE-2026-86415 |
|---|---|
| State | PUBLISHED |
| Assigner | curl |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-20 21:17:20 UTC |
| Updated | 2026-10-20 21:17:20 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-201 Information Exposure Through Sent Data
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| hackerone.com/reports/3993870 | 2499f714-1537-4658-8207-48ae4bb9eae9 | hackerone.com | |
| curl.se/docs/CVE-2026-86415.html | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | |
| curl.se/docs/CVE-2026-86415.json | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Stanislav Fort (Aisle Research) (en)
CNA: Stefan Eissing (en)
There are currently no legacy QID mappings associated with this CVE.