CVE-2026-87865

high

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.

References

https://hackerone.com/reports/3975408

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105312

https://curl.se/docs/CVE-2026-87865.json

https://curl.se/docs/CVE-2026-87865.html

Details

Source: Mitre, NVD

Published: 2026-10-20

Updated: 2026-10-30

Risk Information

CVSS v2

Base Score: 7.1

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 7.4

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