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CVE-2026-3731— libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds

CVSS 5.3 · Medium EPSS 0.11% · P29
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I. Basic Information for CVE-2026-3731

Vulnerability Information
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Vulnerability Title
libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds
Source: NVD (National Vulnerability Database)
Vulnerability Description
A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
libssh 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh是libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh 0.11.3及之前版本存在缓冲区错误漏洞，该漏洞源于对文件src/sftp.c中参数idx的错误操作，可能导致越界读取。
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
-libssh 0.11.0 cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3731

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III. Intelligence Information for CVE-2026-3731

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IV. Related Vulnerabilities

Same product: libssh
Same vendor: n/a
Same weakness: CWE-125

V. Comments for CVE-2026-3731

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