CVE-2026-30827

Published: Mar 07, 2026 Last Modified: Mar 11, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

express-rate-limit is a basic rate-limiting middleware for Express. In versions starting from 8.0.0 and prior to versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0, the default keyGenerator in express-rate-limit applies IPv6 subnet masking (/56 by default) to all addresses that net.isIPv6() returns true for. This includes IPv4-mapped IPv6 addresses (::ffff:x.x.x.x), which Node.js returns as request.ip on dual-stack servers. Because the first 80 bits of all IPv4-mapped addresses are zero, a /56 (or any /32 to /80) subnet mask produces the same network key (::/56) for every IPv4 client. This collapses all IPv4 traffic into a single rate-limit bucket: one client exhausting the limit causes HTTP 429 for all other IPv4 clients. This issue has been patched in versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0001
Percentile
0,0th
Updated

EPSS Score Trend (Last 9 Days)

770

Allocation of Resources Without Limits or Throttling

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Availability
Potential Impacts:
Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other)
Applicable Platforms
All platforms may be affected
Likelihood of Exploit: High
View CWE Details
Application

Express-Rate-Limit by Express-Rate-Limit Project

Product Information
Vendor Express-Rate-Limit Project
Product Express-Rate-Limit
Version Range Affected
From 8.0.0 (inclusive)
To 8.0.2 (exclusive)
cpe:2.3:a:express-rate-limit_project:express-rate-limit:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Express-Rate-Limit by Express-Rate-Limit Project

Product Information
Vendor Express-Rate-Limit Project
Product Express-Rate-Limit
Version 8.1.0
cpe:2.3:a:express-rate-limit_project:express-rate-limit:8.1.0:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Express-Rate-Limit by Express-Rate-Limit Project

Product Information
Vendor Express-Rate-Limit Project
Product Express-Rate-Limit
Version Range Affected
From 8.2.0 (inclusive)
To 8.2.2 (exclusive)
cpe:2.3:a:express-rate-limit_project:express-rate-limit:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/express-rate-limit/express-rate-limit/co…
https://github.com/express-rate-limit/express-rate-limit/commit/14e53888cdfd1b9…
https://github.com/express-rate-limit/express-rate-limit/se…
https://github.com/express-rate-limit/express-rate-limit/security/advisories/GH…