Detections
Analytics

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

critical Tenable Self-Hosted Container Security Plugin ID 462514

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, the libevent evhttp parser in
 http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding
 values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header,
 evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize
 valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than
 EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy
 that frames the same request differently, an unauthenticated remote attacker can desynchronize request
 boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This
 issue is fixed in versions 2.1.13 and 2.2.2-alpha. (CVE-2026-63382)

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-2026-63382

Plugin Details

Severity: Critical

ID: 462514

Version: Revision 1.1

Type: Local

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-2026-63382

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-2026-63382