CVE-2018-9918

Publication date 10 April 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

libqpdf.a in QPDF through 8.0.2 mishandles certain "expected dictionary key but found non-name object" cases, allowing remote attackers to cause a denial of service (stack exhaustion), related to the QPDFObjectHandle and QPDF_Dictionary classes, because nesting in direct objects is not restricted.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qpdf	18.04 LTS bionic	Not affected
	17.10 artful	Fixed 8.0.2-3~17.10.1
	16.04 LTS xenial	Fixed 8.0.2-3~16.04.1
	14.04 LTS trusty	Fixed 8.0.2-3~14.04.1

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
qpdf	Upstream: b4d6cf6

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.8 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.8 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3638-1
QPDF vulnerabilities
7 May 2018

Other references

https://www.cve.org/CVERecord?id=CVE-2018-9918