CVE-2026-66032

Katalog CVE

CVSS 8.8 · High EPSS 0,45%

Kerentanan Double Free pada libssh2. Skor CVSS 3.1 8.8 (High) menurut vulncheck.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

24 Juli 2026

Terakhir diubah

7 Agustus 2026

Status NVD

Analyzed

CVSS 3.1

8.8 (High), sumber vulncheck.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-415: Double Free

EPSS (30 hari)

0,45% peluang dieksploitasi; lebih tinggi dari 37,2% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0 patch
• https://github.com/libssh2/libssh2/pull/2180 issue tracking · patch
• https://www.vulncheck.com/advisories/libssh2-double-free-heap-corruption-via-sftp-open patch · advisory pihak ketiga