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

critical Tenable Cloud Security Plugin ID 458048

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 two HTTP parsing
weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL
characters, which can cause downstream C string operations to truncate a path and bypass validation
performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding
in header values containing carriage return or line feed characters, allowing a proxy and libevent to
interpret headers differently and enabling header injection or access control bypass. The CRLF header
acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate
the URI NUL-truncation condition. (CVE-2026-63385)

Solution

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

Plugin Details

Severity: Critical

ID: 458048

Version: Revision 1.1

Type: Local

Family: Echo Local Security Checks

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

Percentile: 57.72

CVSS v2

Risk Factor: High

Base Score: 7.3

Temporal Score: 5.4

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

CVSS Score Source: CVE-2026-63385

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.7

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:L/SI:L/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-2026-63385

Detections

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