4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-53604

CVE-2025-53604: Rust Web Push is vulnerable to a DoS attack via a large integer in a Content-Length header

The web-push crate before 0.10.4 for Rust allows a denial of service (memory consumption) in the built-in clients via a large integer in a Content-Length header. The patch was initially made available in version 0.10.3, but version 0.10.3 has since been yanked.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-53604

CVE-2025-53604:

4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
web-push	rust	<= 0.10.2	0.10.4

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the handling of responses from web push services within the web-push crate. Specifically, the send methods in the built-in hyper and isahc clients were susceptible to a denial-of-service attack. The root cause was that both implementations blindly trusted the Content-Length header returned by the push service. The code would parse this header and immediately attempt to allocate a memory buffer of the specified size to hold the response body. An attacker, or a compromised push service, could return a response with an extremely large Content-Length value. This would trigger a massive memory allocation on the client-side, exhausting available memory and causing the application to crash, resulting in a denial of service. The patch addresses this by removing the code that trusts Content-Length. Instead, it reads the response body in chunks and enforces a hard-coded maximum size limit (MAX_RESPONSE_SIZE), preventing excessive memory allocation.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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