Denial of Service (DoS) Affecting smallvec package, versions >=0.3.2 <0.3.4 >=0.4.0 <0.4.5 >=0.5.0 <0.5.1 >=0.6.0 <0.6.3



    Attack Complexity Low
Expand this section
9.8 critical
Expand this section
9.8 critical

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  • published 4 Oct 2018
  • disclosed 15 May 2018
  • credit Vurich

How to fix?

Upgrade smallvec to versions 0.3.4, 0.4.5, 0.5.1, 0.6.3 or higher.


smallvec is a "Small vector" optimization for Rust: store up to a small number of items on the stack.

Affected versions of this package are vulnerable to Denial of Service (DoS) attacks. If an iterator passed to SmallVec::insert_many panicked in Iterator::next, destructors were run during unwinding while the vector was in an inconsistent state, possibly causing a double free which could lead to denial of service.


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