Filtered by vendor Libssh2
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Total
25 CVE
| CVE | Vendors | Products | Updated | CVSS v2 | CVSS v3 |
|---|---|---|---|---|---|
| CVE-2026-66035 | 1 Libssh2 | 1 Libssh2 | 2026-07-30 | N/A | 7.5 HIGH |
| libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by sending a packet with a packet_length smaller than the cipher's block size during Encrypt-then-MAC cipher negotiation. In the fullpacket() function in src/transport.c, the ETM path allocates a buffer of packet_length bytes but copies blocksize minus one bytes via memcpy, causing an overflow that on 32-bit glibc writes attacker-controlled bytes into an adjacent chunk's SIZE field, enabling tcache bin confusion, overlapping live objects, and function pointer overwrite during the session handshake before authentication. | |||||
| CVE-2026-55199 | 1 Libssh2 | 1 Libssh2 | 2026-07-14 | N/A | 5.9 MEDIUM |
| libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops. | |||||
| CVE-2019-13115 | 5 Debian, F5, Fedoraproject and 2 more | 7 Debian Linux, Traffix Systems Signaling Delivery Controller, Fedora and 4 more | 2026-06-17 | 5.8 MEDIUM | 8.1 HIGH |
| In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855. | |||||
| CVE-2016-0787 | 4 Debian, Fedoraproject, Libssh2 and 1 more | 4 Debian Linux, Fedora, Libssh2 and 1 more | 2026-06-17 | 4.3 MEDIUM | 5.9 MEDIUM |
| The diffie_hellman_sha256 function in kex.c in libssh2 before 1.7.0 improperly truncates secrets to 128 or 256 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug." | |||||
| CVE-2015-1782 | 3 Debian, Fedoraproject, Libssh2 | 3 Debian Linux, Fedora, Libssh2 | 2026-06-17 | 6.8 MEDIUM | N/A |
| The kex_agree_methods function in libssh2 before 1.5.0 allows remote servers to cause a denial of service (crash) or have other unspecified impact via crafted length values in an SSH_MSG_KEXINIT packet. | |||||