Detections
Analytics

Echo: nginx: security update to 1.26.3-3+deb13u6

critical Tenable Cloud Security Plugin ID 462230

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_rewrite_module module. This
 vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-
 Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that
 references multiple such captures (for example, $1$2) in a redirect or arguments context. An
 unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by
 sending crafted HTTP requests. This may cause a heap 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-2026-9256)

Solution

Update the nginx library and its related packages to version 1.26.3-3+deb13u6 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-9256

Plugin Details

Severity: Critical

ID: 462230

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.5

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 6

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

CVSS Score Source: CVE-2026-9256

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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:P/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.2

Threat Vector: CVSS:4.0/E:P

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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/2/2026

Vulnerability Publication Date: 5/22/2026

Reference Information

CVE: CVE-2026-9256

IAVA: 2026-A-0515-S