CVE-2026-7598

Summary

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.

Affected Software

Weaknesses

• CWE-190: Integer Overflow
• CWE-189: Numeric Error

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://vuldb.com/submit/805564

libssh2: integer overflow via large username or password arguments

Additional References

• https://access.redhat.com/security/cve/CVE-2026-7598
• https://bugzilla.redhat.com/show_bug.cgi?id=2464597
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7598.json
• https://access.redhat.com/errata/RHSA-2026:7021
• https://access.redhat.com/errata/RHSA-2026:16736

References

• https://vuldb.com/vuln/360555
• https://vuldb.com/vuln/360555/cti
• https://vuldb.com/submit/805564
• https://github.com/libssh2/libssh2/pull/1858
• https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1
• https://github.com/libssh2/libssh2/

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