CVE-2026-66032

Name
CVE-2026-66032
Description
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. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
disclosure@vulncheck.com https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0
disclosure@vulncheck.com https://github.com/libssh2/libssh2/pull/2180
disclosure@vulncheck.com https://www.vulncheck.com/advisories/libssh2-double-free-heap-corruption-via-sftp-open

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:* libssh2 >= None <= 1.11.1

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
libssh2 edge-main 1.11.1-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.11.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.11.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.9.0-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.9.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 edge-main 1.9.0-r0 None possibly vulnerable
libssh2 edge-main 1.8.1-r0 None possibly vulnerable
libssh2 3.24-main 1.11.1-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.24-main 1.11.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.23-main 1.11.1-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.23-main 1.11.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.23-main 1.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.22-main 1.11.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.22-main 1.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.22-main 1.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.22-main 1.11.0-r1 None possibly vulnerable
libssh2 3.22-main 1.9.0-r1 None possibly vulnerable
libssh2 3.22-main 1.9.0-r0 None possibly vulnerable
libssh2 3.22-main 1.8.1-r0 None possibly vulnerable
libssh2 3.21-main 1.11.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.21-main 1.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.21-main 1.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.21-main 1.11.0-r1 None possibly vulnerable
libssh2 3.21-main 1.9.0-r1 None possibly vulnerable
libssh2 3.21-main 1.9.0-r0 None possibly vulnerable
libssh2 3.21-main 1.8.1-r0 None possibly vulnerable
libssh2 3.20-main 1.11.0-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.20-main 1.11.0-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.20-main 1.11.0-r1 None possibly vulnerable
libssh2 3.20-main 1.9.0-r1 None possibly vulnerable
libssh2 3.20-main 1.9.0-r0 None possibly vulnerable
libssh2 3.20-main 1.8.1-r0 None possibly vulnerable
libssh2 3.19-main 1.11.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
libssh2 3.19-main 1.9.0-r1 None possibly vulnerable
libssh2 3.19-main 1.9.0-r0 None possibly vulnerable
libssh2 3.19-main 1.8.1-r0 None possibly vulnerable