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

high Tenable Self-Hosted Container Security Plugin ID 460571

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 can read beyond a
 contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from
 evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-
 byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which
 can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions
 2.1.13 and 2.2.2-alpha. (CVE-2026-63383)

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-2026-63383

Plugin Details

Severity: High

ID: 460571

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-63383

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

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

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-2026-63383