CVE-2026-66034

Katalog CVE

CVSS 7.5 · High EPSS 0,40%

Kerentanan Out-of-bounds Read pada libssh2. Skor CVSS 3.1 7.5 (High) menurut vulncheck.com.

Deskripsi (NVD)

libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region.

Rincian

Terbit di NVD

24 Juli 2026

Terakhir diubah

30 Juli 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-125: Out-of-bounds Read
CWE-908: Use of Uninitialized Resource

EPSS (30 hari)

0,40% peluang dieksploitasi; lebih tinggi dari 32,6% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99803cd898d9 patch
• https://github.com/libssh2/libssh2/pull/2202 issue tracking · patch
• https://www.vulncheck.com/advisories/libssh2-heap-out-of-bounds-read-via-publickey-subsystem patch · advisory pihak ketiga