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Echo: libevent: security update to 2.1.12-stable-10+e1

high Tenable Cloud Security Plugin ID 458710

Description

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

 - Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-
 bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied
 AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable
 the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into
 the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the
 adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and
 availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha. (CVE-2026-63388)

Solution

Update the libevent library and its related packages to version 2.1.12-stable-10+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-63388

Plugin Details

Severity: High

ID: 458710

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.35

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-63388

CVSS v3

Risk Factor: High

Base Score: 8.4

Temporal Score: 7.3

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/21/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-63388