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CVE-2026-7598— libssh2 userauth.c userauth_password integer overflow

Quick assessment

Affected
n/a libssh2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libssh2是The libssh2 project开源的一款实现SSH2协议的客户端C库，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。 libssh2 1.11.1及之前版本存在数字错误漏洞，该漏洞源于src/userauth.c文件中userauth_password函数对参数username_len/password_len操作不当，可能导致整数溢出。

CVSS 7.3 · High EPSS 0.48% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
n/a libssh2 1.11.0 affected
1.11.1 affected
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I. Basic Information for CVE-2026-7598

Vulnerability Information
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Vulnerability Title
libssh2 userauth.c userauth_password integer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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The libssh2 project开源的一款实现SSH2协议的客户端C库，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。 libssh2 1.11.1及之前版本存在数字错误漏洞，该漏洞源于src/userauth.c文件中userauth_password函数对参数username_len/password_len操作不当，可能导致整数溢出。
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

Vendor Product Affected Versions CPE Subscribe
- libssh2 1.11.0 cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7598

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III. Intelligence Information for CVE-2026-7598

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Patches & Fixes for CVE-2026-7598 (2)

Vendor Pages for CVE-2026-7598 (1)

Same Patch Batch · n/a · 2026-05-01 · 53 CVEs total

CVE-2026-37541 10.0 CRITICAL Open-Vehicle-Monitoring-System-3 安全漏洞
CVE-2026-37539 9.8 CRITICAL cannelloni 安全漏洞
CVE-2026-37531 9.8 CRITICAL Automotive Grade Linux app-framework-main 路径遍历漏洞
CVE-2026-37536 8.8 HIGH Unified Diagnostic Services Support Library in C 安全漏洞
CVE-2026-37540 8.4 HIGH open-amp 输入验证错误漏洞
CVE-2026-37552 8.4 HIGH Mix PHP 代码问题漏洞
CVE-2026-37537 8.1 HIGH Open SAE J1939 输入验证错误漏洞
CVE-2026-37525 7.8 HIGH Automotive Grade Linux app-framework-binder 安全漏洞
CVE-2026-37526 7.8 HIGH Automotive Grade Linux app-framework-binder 访问控制错误漏洞
CVE-2026-37554 7.5 HIGH Vanetza 安全漏洞
CVE-2026-37535 7.1 HIGH ISO-TP (ISO 15765-2) Support Library in C 缓冲区错误漏洞
CVE-2026-37532 7.1 HIGH Automotive Grade Linux agl-service-can-low-level 安全漏洞
CVE-2026-37503 6.9 MEDIUM V2Board 跨站脚本漏洞
CVE-2026-7536 5.3 MEDIUM Open5GS BSF pcfBindings bsf_sess_add_by_ip_address denial of service
CVE-2026-7580 5.3 MEDIUM Exiftool JPEG/QuickTime/MOV/MP4 GM.pm Process_mrld code injection
CVE-2026-37504 5.3 MEDIUM V2Board 安全漏洞
CVE-2026-37505 4.9 MEDIUM V2Board SQL注入漏洞
CVE-2026-7578 4.7 MEDIUM MacCMS Pro Plugin Installation add.html install unrestricted upload
CVE-2026-7586 4.3 MEDIUM Open5GS AMF nudm-handler.c ogs_id_get_value denial of service
CVE-2026-7518 4.3 MEDIUM Open5GS AMF SBI Endpoint sdmsubscription-notify amf_namf_callback_handle_sdm_data_change_n

Showing top 20 of 53 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: libssh2
Same vendor: n/a
Same weakness: CWE-190