Double Free in Libssh2
CVE-2026-66032
libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. Whe…
Vulnerability class: Double Free
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Libssh2 — versions 0, 5e4776146552d898b9c0e1b313cd093fa8dc92d0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking, patch)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-66032?
- CVE-2026-66032 is a high-severity vulnerability in Libssh2, classified under Double Free. CVSS score: 8.8/10. Published 2026-07-24.
- How severe is CVE-2026-66032?
- High severity. CVSS v3 base score is 8.8 out of 10.