Vulnerability Details CVE-2026-58051
libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 19.8%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-58051
-
cpe:2.3:a:libssh2:libssh2:-
-
cpe:2.3:a:libssh2:libssh2:0.1
-
cpe:2.3:a:libssh2:libssh2:0.10
-
cpe:2.3:a:libssh2:libssh2:0.11
-
cpe:2.3:a:libssh2:libssh2:0.12
-
cpe:2.3:a:libssh2:libssh2:0.13
-
cpe:2.3:a:libssh2:libssh2:0.14
-
cpe:2.3:a:libssh2:libssh2:0.15
-
cpe:2.3:a:libssh2:libssh2:0.16
-
cpe:2.3:a:libssh2:libssh2:0.17
-
cpe:2.3:a:libssh2:libssh2:0.18
-
cpe:2.3:a:libssh2:libssh2:0.3
-
cpe:2.3:a:libssh2:libssh2:0.5
-
cpe:2.3:a:libssh2:libssh2:0.6
-
cpe:2.3:a:libssh2:libssh2:0.7
-
cpe:2.3:a:libssh2:libssh2:0.8
-
cpe:2.3:a:libssh2:libssh2:1.0
-
cpe:2.3:a:libssh2:libssh2:1.1
-
cpe:2.3:a:libssh2:libssh2:1.10.0
-
cpe:2.3:a:libssh2:libssh2:1.2
-
cpe:2.3:a:libssh2:libssh2:1.2.1
-
cpe:2.3:a:libssh2:libssh2:1.2.2
-
cpe:2.3:a:libssh2:libssh2:1.2.3
-
cpe:2.3:a:libssh2:libssh2:1.2.4
-
cpe:2.3:a:libssh2:libssh2:1.2.5
-
cpe:2.3:a:libssh2:libssh2:1.2.6
-
cpe:2.3:a:libssh2:libssh2:1.2.7
-
cpe:2.3:a:libssh2:libssh2:1.2.8
-
cpe:2.3:a:libssh2:libssh2:1.2.9
-
cpe:2.3:a:libssh2:libssh2:1.3.0
-
cpe:2.3:a:libssh2:libssh2:1.4.0
-
cpe:2.3:a:libssh2:libssh2:1.4.1
-
cpe:2.3:a:libssh2:libssh2:1.4.2
-
cpe:2.3:a:libssh2:libssh2:1.4.3
-
cpe:2.3:a:libssh2:libssh2:1.5.0
-
cpe:2.3:a:libssh2:libssh2:1.6.0
-
cpe:2.3:a:libssh2:libssh2:1.7.0
-
cpe:2.3:a:libssh2:libssh2:1.8.0
-
cpe:2.3:a:libssh2:libssh2:1.8.1
-
cpe:2.3:a:libssh2:libssh2:1.8.2
-
cpe:2.3:a:libssh2:libssh2:1.9.0