Integer Overflow in libssh2 userauth_password
CVE-2026-7598 is an integer overflow vulnerability in libssh2 affecting versions up to and including 1.11.1. The vulnerable code is in the userauth_password function in src/userauth.c. According to the provided content, manipulation of the username_len and password_len arguments can trigger an integer overflow during processing of SSH password-authentication data. Because libssh2 is a client-side SSH2 library, exploitation would occur in applications that use vulnerable libssh2 code paths and process attacker-controlled or otherwise untrusted authentication-related input. The issue is remotely triggerable and may lead to memory corruption or other undefined behavior.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
11 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.