汇总 libssh2 相关全部产品的 CVE 与安全漏洞情报，包括 CVSS、EPSS、公开时间与漏洞情报数据。
历史漏洞主要涉及 缓冲区溢出与内存损坏 等问题，部分漏洞可能导致 应用崩溃，并影响 软件部署与生产负载 相关场景。
相关漏洞数据主要来源于公开漏洞披露与安全公告，可用于评估历史漏洞暴露面与修复优先级。
| CVE | 摘要 | 来源 | 最高 CVSS | EPSS % | 公开时间 | 更新时间 |
|---|---|---|---|---|---|---|
| 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. | [email protected] | 8.3 | 0.28% | 2026-06-27 | 2026-06-29 |
| CVE-2026-58050 | libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client. | [email protected] | 8.3 | 0.31% | 2026-06-27 | 2026-06-29 |
| CVE-2025-15661 | libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len | [email protected] | 8.3 | 0.27% | 2026-06-18 | 2026-06-25 |
| CVE-2026-55200 | libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution. | [email protected] | 9.2 | 0.91% | 2026-06-17 | 2026-06-26 |
| CVE-2026-55199 | 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 ti | [email protected] | 8.2 | 0.38% | 2026-06-17 | 2026-06-26 |
| CVE-2026-7598 | A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue. | [email protected] | 6.9 | 0.36% | 2026-05-01 | 2026-06-17 |
| CVE-2023-48795 | The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the ha | [email protected] | 5.9 | 93.31% | 2023-12-18 | 2026-06-17 |
| CVE-2020-22218 | An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out of bounds memory. | [email protected] | 7.5 | 0.91% | 2023-08-22 | 2026-06-16 |
| CVE-2019-17498 | In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted 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. | [email protected] | 8.1 | 3.76% | 2019-10-21 | 2026-06-16 |
| CVE-2019-13115 | 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 | [email protected] | 8.1 | 11.66% | 2019-07-16 | 2026-06-16 |
| CVE-2019-3861 | An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet length are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory. | [email protected] | 5.0 | 5.12% | 2019-03-25 | 2026-06-16 |
| CVE-2019-3860 | An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SFTP packets with empty payloads are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory. | [email protected] | 5.0 | 5.12% | 2019-03-25 | 2026-06-16 |
| CVE-2019-3857 | An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. | [email protected] | 8.8 | 6.13% | 2019-03-25 | 2026-06-16 |
| CVE-2019-3856 | An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. | [email protected] | 8.8 | 6.13% | 2019-03-25 | 2026-06-16 |
| CVE-2019-3863 | A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error. | [email protected] | 7.5 | 3.44% | 2019-03-25 | 2026-06-16 |
| CVE-2019-3858 | An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory. | [email protected] | 5.0 | 6.45% | 2019-03-21 | 2026-06-16 |
| CVE-2019-3855 | An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. | [email protected] | 8.8 | 9.22% | 2019-03-21 | 2026-06-16 |
| CVE-2019-3862 | An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory. | [email protected] | 7.3 | 8.11% | 2019-03-21 | 2026-06-16 |
| CVE-2019-3859 | An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory. | [email protected] | 9.1 | 6.28% | 2019-03-21 | 2026-06-16 |
| CVE-2016-0787 | 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." | [email protected] | 5.9 | 2.70% | 2016-04-13 | 2026-06-16 |