The vulnerability CVE-2026-7598 in libssh2 up to version 1.11.1 involves an integer overflow in the userauth_password function located in src/userauth.c. The issue arises from improper handling of the username_len and password_len arguments, which can be manipulated to trigger an integer overflow condition. This flaw can be exploited remotely, potentially impacting authentication processes. The patch is referenced by commit 256d04b60d80bf1190e96b0ad1e91b2174d744b1. Red Hat has published advisories referencing this CVE, but their content does not explicitly confirm the availability of a patch or remediation status for affected products.

The integer overflow vulnerability may allow an attacker to cause unexpected behavior in the authentication function of libssh2, potentially leading to denial of service or other impacts related to authentication integrity. The CVSS 4.0 base score is 6.9 (medium severity), indicating a significant but not critical risk. There are no known exploits in the wild at this time.

A patch addressing this vulnerability has been identified (commit 256d04b60d80bf1190e96b0ad1e91b2174d744b1). However, the vendor advisories from Red Hat do not explicitly confirm the availability of an official fix or provide detailed remediation instructions. Users should monitor the vendor advisories for updates and apply any official patches once available. Until then, cautious use of affected versions is advised.