CVE-2018-18020
In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.
Does this matter?
Lower severity and a low EPSS score (1.21%). Track it; it rarely justifies an emergency change on its own.
Description
In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.
- CVSS 3.0
- 3.3 LOWCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- EPSS
- 1.21% probability · 68th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-674
- Affected
- qpdf project/qpdf
- Source
- cve@mitre.org
EPSS 1.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/qpdf/qpdf/issues/243Exploit, Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/08/msg00037.html
- https://github.com/qpdf/qpdf/issues/243Exploit, Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/08/msg00037.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.