CVE-2018-20349

Publication date 22 December 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The igraph_i_strdiff function in igraph_trie.c in igraph through 0.7.1 has an NULL pointer dereference that allows attackers to cause a denial of service (application crash) via a crafted object.

From the Ubuntu Security Team

It was discovered that igraph mishandled certain malformed XML. An attacker could use this vulnerability to cause a denial of service (crash).

Status

Show unmaintained releases

Package	Ubuntu Release	Status
igraph	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Ignored end of life
	18.04 LTS bionic	Fixed 0.7.1-2.1+deb9u1build0.18.04.1
	16.04 LTS xenial	Fixed 0.7.1-2.1+deb9u1build0.16.04.1
	14.04 LTS trusty	Not in release

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-4644-1
igraph vulnerability
27 November 2020