The vulnerability of the libssh2_publickey_listFetch() function in the libssh2 library allows a hacker to trigger a denial-of-service attack.

The vulnerability of the libssh2publickeylistFetch function in the libssh2 library is related to the use of uninitialized resources. Exploiting this vulnerability could allow a malicious actor to cause service failures...

CVE-2026-58051

libssh2 through 1.11.1 grows its publickey list with SSH2REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2publickeylistfree operating on an uninitialized entry. A malicious SSH server offering the publickey...

CVE-2026-58051 libssh2 - Free of Uninitialized Pointer in publickey List Cleanup

libssh2 through 1.11.1 grows its publickey list with SSH2REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2publickeylistfree operating on an uninitialized entry. A malicious SSH server offering the publickey...