CVEvulnerability
CVE-2026-9547
7.4 HIGH
Official page ↗
- Status
- Modified
- Published
- 2026-07-03
- Last modified
- 2026-09-15
- Assigner
- 2499f714-1537-4658-8207-48ae4bb9eae9
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-297
Description
When a libcurl-based application performs transfers via `SCP://` or `SFTP://`
and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an
untrusted server. This vulnerability occurs when a server presents a host key
type that does not match the specific key type already recorded for that host
in the `known_hosts` file. Instead of rejecting the mismatch, the callback
mechanism fails to properly enforce the restriction, allowing the connection
to succeed without warning and risking a potential man-in-the-middle attack.
Affected configurations
• haxx curl (>= 7.69.0 < 8.21.0)
Related
Weakness · CWE (1)
- CWE-297 Improper Validation of Certificate with Host Mismatch weakness
References
- https://curl.se/docs/CVE-2026-9547.html Patch, Vendor Advisory
- https://curl.se/docs/CVE-2026-9547.json Vendor Advisory
- https://hackerone.com/reports/3751712 Exploit, Issue Tracking, Third Party Advisory
- https://hackerone.com/reports/3751712 Exploit, Issue Tracking, Third Party Advisory