Improper Validation of Certificate with Host Mismatch Affecting libcurl package, versions [7.76.0,8.18.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-LIBCURL-14900428
- published8 Jan 2026
- disclosed8 Jan 2026
- creditHarry Sintonen
Introduced: 8 Jan 2026
CVE-2025-15079 (opens in a new tab)How to fix?
Upgrade libcurl to version 8.18.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch due to the libssh API fallback to a built-in global known_hosts file if the host was not found in the specified one. An attacker can bypass host authenticity checks by leveraging entries in the global known_hosts file even when a custom known_hosts file is specified.
Note:
This issue affects only for curl built with libssh backend, libssh2 backend is not affected.