Medium severity · published Jan 8, 2026
CVE-2025-15079
libssh global known_hosts override
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
When doing SSH-based transfers using either SCP or SFTP, and setting the
known_hosts file, libcurl could still mistakenly accept connecting to hosts
*not present* in the specified file if they were added as recognized in the
libssh *global* known_hosts file.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
7.58.0 before 8.14.2; 8.15.0 before 8.16.1; 8.17.0 before 8.18.0; c92d2e14cfb0db662f958effd2ac86f995cf1b5a before adca486c125d9a6d9565b9607a19dce803a8b479; 8.17.0; 8.16.0; +34 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-15079
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-15079
Patch
https://curl.se/docs/CVE-2025-15079.html
Vendor Advisory
https://curl.se/docs/CVE-2025-15079.json
Exploit
https://hackerone.com/reports/3477116
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/07/6
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