Detections
Analytics

Echo: nginx: security update to 1.26.3-3+deb13u7

critical Tenable Cloud Security Plugin ID 459368

Description

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

 - NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and
 ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass
 directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the
 large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker,
 along with conditions beyond their control, could send large headers while creating an upstream request.
 This may cause a heap-based buffer overflow in the NGINX worker process leading to a restart.
 Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR)
 disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical
 Support (EoTS) are not evaluated. (CVE-2026-42055)

Solution

Update the nginx library and its related packages to version 1.26.3-3+deb13u7 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-42055

Plugin Details

Severity: Critical

ID: 459368

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.18

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

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

CVSS Score Source: CVE-2026-42055

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/18/2026

Vulnerability Publication Date: 6/17/2026

Reference Information

CVE: CVE-2026-42055

IAVA: 2026-A-0601-S