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

medium Tenable Self-Hosted Container Security Plugin ID 463075

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 processes chunked
 HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix
 introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote
 attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent
 application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-
 header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards
 them instead of merging them into req->input_headers. This issue is fixed in versions 2.1.13 and
 2.2.2-alpha. (CVE-2026-63379)

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-2026-63379

Plugin Details

Severity: Medium

ID: 463075

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.1

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-63379

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/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-2026-63379