CVE-2026-87865
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libcurl libssh2 Host Key Validation Bypass via Known Hosts Entry
Vulnerability report for CVE-2026-87865, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-20
Last updated on: 2026-10-30
Assigner: curl
Description
Description
When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated
initial entry can cause host key validation to report a key *mismatch* as a
*missing* key to the `CURLOPT_SSH_KEYFUNCTION` callback.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| curl | curl | 8.22.0 |
| curl | curl | 8.21.0 |
| curl | curl | 8.20.0 |
| curl | curl | 8.19.0 |
| curl | curl | 8.18.0 |
| curl | curl | 8.17.0 |
| curl | curl | 8.16.0 |
| curl | curl | 8.15.0 |
| curl | curl | 8.14.1 |
| curl | curl | 8.14.0 |
| curl | curl | 8.13.0 |
| curl | curl | 8.12.1 |
| curl | curl | 8.12.0 |
| curl | curl | 8.11.1 |
| curl | curl | 8.11.0 |
| curl | curl | 8.10.1 |
| curl | curl | 8.10.0 |
| curl | curl | 8.9.1 |
| curl | curl | 8.9.0 |
| curl | curl | 8.8.0 |
| curl | curl | 8.7.1 |
| curl | curl | 8.7.0 |
| curl | curl | 8.6.0 |
| curl | curl | 8.5.0 |
| curl | curl | 8.4.0 |
| curl | curl | 8.3.0 |
| curl | curl | 8.2.1 |
| curl | curl | 8.2.0 |
| curl | curl | 8.1.2 |
| curl | curl | 8.1.1 |
| curl | curl | 8.1.0 |
| curl | curl | 8.0.1 |
| curl | curl | 8.0.0 |
| curl | curl | 7.88.1 |
| curl | curl | 7.88.0 |
| curl | curl | 7.87.0 |
| curl | curl | 7.86.0 |
| curl | curl | 7.85.0 |
| curl | curl | 7.84.0 |
| curl | curl | 7.83.1 |
| curl | curl | 7.83.0 |
| curl | curl | 7.82.0 |
| curl | curl | 7.81.0 |
| curl | curl | 7.80.0 |
| curl | curl | 7.79.1 |
| curl | curl | 7.79.0 |
| curl | curl | 7.78.0 |
| curl | curl | 7.77.0 |
| curl | curl | 7.76.1 |
| curl | curl | 7.76.0 |
| curl | curl | 7.75.0 |
| curl | curl | 7.74.0 |
| curl | curl | 7.73.0 |
| curl | curl | 7.72.0 |
| curl | curl | 7.71.1 |
| curl | curl | 7.71.0 |
| curl | curl | 7.70.0 |
| curl | curl | 7.69.1 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-295 | The product does not validate, or incorrectly validates, a certificate. |
