Echo: libssh2: security update to 1.11.1-1+e5

high Tenable Self-Hosted Container Security Plugin ID 463854

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- 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.
(CVE-2026-66032)

Solution

Update the libssh2 library and its related packages to version 1.11.1-1+e5 or later.

Plugin Details

Severity: High

ID: 463854

Version: Revision 1.2

Type: Local

Family: Echo Local Security Checks

Published: 10/2/2026

Updated: 10/8/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.51

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-66032

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 8.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/25/2026

Vulnerability Publication Date: 7/24/2026

Reference Information

CVE: CVE-2026-66032

IAVA: 2026-A-0788

Detections

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