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CVE-2026-58050— libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation

CVSS 7.0 · High EPSS 0.71% · P51

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
libssh2libssh2≤ 1.11.1affected
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I. Basic Information for CVE-2026-58050

Vulnerability Information
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Vulnerability Title
libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
libssh2 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh2是libssh2团队开源的一款实现SSH2协议的客户端C库。 libssh2 1.11.1及之前版本存在数字错误漏洞，该漏洞源于整数溢出，在32位平台上乘法溢出导致缓冲区分配不足，可能导致恶意SSH服务器驱动属性解析循环越界写入，造成堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
libssh2libssh2 0 ~ 1.11.1 -

II. Public POCs for CVE-2026-58050

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11090 chars
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III. Intelligence Information for CVE-2026-58050

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Vendor Advisories for CVE-2026-58050 (1)

Proof of Concept for CVE-2026-58050 (1)

IV. Related Vulnerabilities

Same product: libssh2
Same vendor: libssh2
Same weakness: CWE-190

V. Comments for CVE-2026-58050

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