Debian Libssh vulnerabilities

CVE-2020-1730 [MEDIUM] CVE-2020-1730: libssh - A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it ... A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability. Scope: local

CVE-2020-16135 [MEDIUM] CVE-2020-16135: libssh - libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new re... libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL. Scope: local bookworm: resolved (fixed in 0.9.5-1) bullseye: resolved (fixed in 0.9.5-1) forky: resolved (fixed in 0.9.5-1) sid: resolved (fixed in 0.9.5-1) trixie: resolved (fixed in 0.9.5-1)

CVE-2014-8132 [MEDIUM] CVE-2014-8132: libssh - Double free vulnerability in the ssh_packet_kexinit function in kex.c in libssh ... Double free vulnerability in the ssh_packet_kexinit function in kex.c in libssh 0.5.x and 0.6.x before 0.6.4 allows remote attackers to cause a denial of service via a crafted kexinit packet. Scope: local bookworm: resolved (fixed in 0.6.3-4) bullseye: resolved (fixed in 0.6.3-4) forky: resolved (fixed in 0.6.3-4) sid: resolved (fixed in 0.6.3-4) trixie: resolved (fi

CVE-2023-6918 [LOW] CVE-2023-6918: libssh - A flaw was found in the libssh implements abstract layer for message digest (MD)... A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys

CVE-2026-0967 [MEDIUM] CVE-2026-0967: libssh - A flaw was found in libssh. A remote attacker, by controlling client configurati... A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client. Scope: local

CVE-2023-6004 [MEDIUM] CVE-2023-6004: libssh - A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, ... A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter. Scope: local bookworm: resolved (fixed in 0.10.6-0+deb12u1) bullseye: resolved (fixed in 0.9.8-0+

CVE-2025-4877 [MEDIUM] CVE-2025-4877: libssh - There's a vulnerability in the libssh package where when a libssh consumer passe... There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a hea

CVE-2012-4561 [MEDIUM] CVE-2012-4561: libssh - The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (... The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors. Scope: local bookworm: resolved (fixed in 0.5.3-1) bullseye:

CVE-2013-0176 [MEDIUM] CVE-2013-0176: libssh - The publickey_from_privatekey function in libssh before 0.5.4, when no algorithm... The publickey_from_privatekey function in libssh before 0.5.4, when no algorithm is matched during negotiations, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a "Client: Diffie-Hellman Key Exchange Init" packet. Scope: local bookworm: resolved (fixed in 0.5.4-1) bullseye: resolved (fixed in 0.5.4-1) forky: resolved (fix

CVE-2025-8114 [MEDIUM] CVE-2025-8114: libssh - A flaw was found in libssh, a library that implements the SSH protocol. When cal... A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL pointer dereference. This issue can cause the client or server to crash. Scope: local bookworm: resolved (fixed in 0.10.6-0+deb12u2) bullseye: resolved (fixed

CVE-2026-0965 [LOW] CVE-2026-0965: libssh - A flaw was found in libssh where it can attempt to open arbitrary files during c... A flaw was found in libssh where it can attempt to open arbitrary files during configuration parsing. A local attacker can exploit this by providing a malicious configuration file or when the system is misconfigured. This vulnerability could lead to a Denial of Service (DoS) by causing the system to try and access dangerous files, such as block devices or large system f

CVE-2026-0968 [CRITICAL] CVE-2026-0968: libssh - A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol... A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected behavior or lead to a denial of service (DoS) du

CVE-2025-4878 [LOW] CVE-2025-4878: libssh - A vulnerability was found in libssh, where an uninitialized variable exists unde... A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption. Scope: local bookworm: resolved (fixed in 0.10.6-0+deb12u2) bullseye: resolved (fixed in 0

CVE-2025-8277 [LOW] CVE-2025-8277: libssh - A flaw was found in libssh's handling of key exchange (KEX) processes when a cli... A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability. S

CVE-2014-0017 [LOW] CVE-2014-0017: libssh - The RAND_bytes function in libssh before 0.6.3, when forking is enabled, does no... The RAND_bytes function in libssh before 0.6.3, when forking is enabled, does not properly reset the state of the OpenSSL pseudo-random number generator (PRNG), which causes the state to be shared between children processes and allows local users to obtain sensitive information by leveraging a pid collision. Scope: local bookworm: resolved (fixed in 0.5.4-3) bullseye: r