Denial of Service (DoS) Affecting com.fasterxml.jackson.core:jackson-core package, versions [,2.8.6)



    Attack Complexity Low

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  • published 20 Sep 2017
  • disclosed 12 Jan 2017
  • credit Alessio Soldano

Introduced: 12 Jan 2017

CVE NOT AVAILABLE CWE-399 Open this link in a new tab

How to fix?

Upgrade com.fasterxml.jackson.core:jackson-core to version 2.8.6 or higher.


com.fasterxml.jackson.core:jackson-core is a Core Jackson abstractions, basic JSON streaming API implementation

Affected versions of this package are vulnerable to Denial of Service (DoS). If the REST endpoint consumes POST requests with JSON or XML data and data are invalid, the first unrecognized token is printed to server.log

If the first token is word of length 10MB, the whole word is printed. This is potentially dangerous and can be used to attack the server by filling the disk with logs.


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