Out-of-bounds Read Affecting libssh2 package, versions [0,]
Threat Intelligence
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-LIBSSH2-17660956
- published28 Jun 2026
- disclosed18 Jun 2026
- creditUnknown
Introduced: 18 Jun 2026
CVE-2025-15661 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read via the sftp_symlink function. An attacker can cause the application to crash or disclose sensitive heap memory by sending a specially crafted SFTP response from a malicious SSH server or through a man-in-the-middle position.
Workaround
This vulnerability can be mitigated by implementing strict network egress filtering to allow outbound SSH/SFTP traffic only to known, trusted endpoints. Additionally, enforce strict SSH host key checking in client applications to reject unknown servers and prevent man-in-the-middle attacks.