Denial of Service (DoS) Affecting package, versions



    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.41% (74th percentile)
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7.5 high
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Red Hat
5.3 medium

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  • published 9 Oct 2018
  • disclosed 25 Sep 2018
  • credit Unknown

How to fix?

Upgrade to sha d26f9f9a57f3fab6a695bec0d84433c2c50f8bbf or higher.

Overview is a package that implements an HTML5-compliant tokenizer and parser.

Affected versions of this package are vulnerable to Denial of Service (DoS) due to an infinite loop during an html.Parse call.


Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package