Detections
Analytics
TencentOS Server 4: grafana (TSSA-2026:0007)
high Nessus Plugin ID 282604
Synopsis
The remote TencentOS Server 4 host is missing one or more security updates.Description
The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0007 advisory.Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:
CVE-2025-15284:
Improper Input Validation vulnerability in qs (parse modules) allows HTTP DoS.This issue affects qs: < 6.14.1.
SummaryThe arrayLimitoption in qs does not enforce limits for bracket notation (a[]=1&a[]=2), allowing attackers to cause denial-of-service via memory exhaustion. Applications using arrayLimitfor DoS protection are vulnerable.
DetailsThe arrayLimitoption only checks limits for indexed notation (a[0]=1&a[1]=2) but completely bypasses it for bracket notation (a[]=1&a[]=2).
Vulnerable code(lib/parse.js:159-162):
if (root === '[]' && options.parseArrays) { obj = utils.combine([], leaf); // No arrayLimit check }
Working code(lib/parse.js:175):
else if (index <= options.arrayLimit) { // Limit checked here obj = [];
obj[index] = leaf;
}
The bracket notation handler at line 159 uses utils.combine([], leaf)without validating against options.arrayLimit, while indexed notation at line 175 checks index <= options.arrayLimitbefore creating arrays.
PoCTest 1 - Basic bypass:
npm install qs
const qs = require('qs');
const result = qs.parse('a[]=1&a[]=2&a[]=3&a[]=4&a[]=5&a[]=6', { arrayLimit: 5 });
console.log(result.a.length); // Output: 6 (should be max 5)
Test 2 - DoS demonstration:
const qs = require('qs');
const attack = 'a[]=' + Array(10000).fill('x').join('&a[]=');
const result = qs.parse(attack, { arrayLimit: 100 });
console.log(result.a.length); // Output: 10000 (should be max 100)
Configuration:
* arrayLimit: 5(test 1) or arrayLimit: 100(test 2)
* Use bracket notation: a[]=value(not indexed a[0]=value)
ImpactDenial of Service via memory exhaustion. Affects applications using qs.parse()with user-controlled input and arrayLimitfor protection.
Attack scenario:
* Attacker sends HTTP request: GET /api/search?filters[]=x&filters[]=x&...&filters[]=x(100,000+ times)
* Application parses with qs.parse(query, { arrayLimit: 100 })
* qs ignores limit, parses all 100,000 elements into array
* Server memory exhausted application crashes or becomes unresponsive
* Service unavailable for all users Real-world impact:
* Single malicious request can crash server
* No authentication required
* Easy to automate and scale
* Affects any endpoint parsing query strings with bracket notation
Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
Plugin Details
Severity: High
ID: 282604
File Name: tencentos_TSSA_2026_0007.nasl
Version: 1.1
Type: local
Family: Tencent Local Security Checks
Published: 1/12/2026
Updated: 1/12/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2025-15284
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.6
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: p-cpe:/a:tencent:tencentos_server:grafana, cpe:/o:tencent:tencentos_server:4
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/etc/os-release, Host/TencentOS/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 1/8/2026
Vulnerability Publication Date: 12/29/2025
Reference Information
CVE: CVE-2025-15284