CVE catalog
CVE-2018-18020
qpdf: CVE-2018-18020
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.21% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | qpdf | sid | 12.4.2-1 | fixed |
| Debian | qpdf | forky | 12.4.2-1 | fixed |
| Debian | qpdf | trixie | 12.2.0-1 | fixed |
| Debian | qpdf | bookworm | 11.3.0-1+deb12u1 | fixed |
| Ubuntu | qpdf | pro | 5.1.3-2 | vulnerable |
| Ubuntu | qpdf | pro | 5.1.3-3 | vulnerable |
| Ubuntu | qpdf | pro | 5.2.0-1 | vulnerable |
| Ubuntu | qpdf | pro | 5.2.0-2 | vulnerable |
| Ubuntu | qpdf | pro | 6.0.0-2 | vulnerable |
| Ubuntu | qpdf | pro | 8.0.2-3~16.04.1 | vulnerable |
| Ubuntu | qpdf | pro | 8.0.2-3~16.04.1+esm1 | fixed |
| Ubuntu | qpdf | pro | 5.1.3-2 | vulnerable |
| Ubuntu | qpdf | pro | 5.1.3-3 | vulnerable |
| Ubuntu | qpdf | pro | 5.2.0-1 | vulnerable |
| Ubuntu | qpdf | pro | 5.2.0-2 | vulnerable |
| Ubuntu | qpdf | pro | 6.0.0-2 | vulnerable |
| Ubuntu | qpdf | pro | 8.0.2-3~16.04.1 | vulnerable |
| Ubuntu | qpdf | pro | 8.0.2-3~16.04.1+esm1 | fixed |
| Ubuntu | qpdf | 18.04 | 7.0.0-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 7.1.0-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 7.1.1-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.0-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.1-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.2-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.2-3 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.2-3ubuntu0.1 | fixed |
| Ubuntu | qpdf | 18.04 | 7.0.0-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 7.1.0-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 7.1.1-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.0-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.1-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.2-1 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.2-3 | vulnerable |
| Ubuntu | qpdf | 18.04 | 8.0.2-3ubuntu0.1 | fixed |
| Ubuntu | qpdf | 20.04 | 8.4.2-1 | vulnerable |
| Ubuntu | qpdf | 20.04 | 9.0.2-1 | vulnerable |
| Ubuntu | qpdf | 20.04 | 9.1.0-1 | vulnerable |
| Ubuntu | qpdf | 20.04 | 9.1.1-1 | vulnerable |
| Ubuntu | qpdf | 20.04 | 9.1.1-1build1 | vulnerable |
| Ubuntu | qpdf | 20.04 | 9.1.1-1ubuntu0.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | qpdf | source | sid | 9.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | qpdf | source | forky | 9.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | qpdf | source | trixie | 9.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | qpdf | source | bookworm | 9.0.0-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | qpdf | deb | pro | 8.0.2-3~16.04.1+esm1 | Not reported | USN-5026-2 | Not reported |
| Ubuntu | qpdf | deb | pro | 8.0.2-3~16.04.1+esm1 | Not reported | UBUNTU-CVE-2018-18020 | Not reported |
| Ubuntu | qpdf | deb | 18.04 | 8.0.2-3ubuntu0.1 | Not reported | UBUNTU-CVE-2018-18020 | Not reported |
| Ubuntu | qpdf | deb | 18.04 | 8.0.2-3ubuntu0.1 | Not reported | USN-5026-1 | Not reported |
| Ubuntu | qpdf | deb | 20.04 | 9.1.1-1ubuntu0.1 | Not reported | USN-5026-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libqpdf29]Fixed
Source package: [qpdf]
Details (2)
11.3.0-1+deb12u1· amd64 · bookwormFixed · Fixed:
9.0.0-1dsa · qpdf · debian · bookworm; dsa · qpdf · debian · 12
11.3.0-1+deb12u1· arm64 · bookwormFixed · Fixed:
9.0.0-1dsa · qpdf · debian · bookworm; dsa · qpdf · debian · 12
- [libqpdf-dev]Fixed
Source package: [qpdf]
Details (2)
11.3.0-1+deb12u1· amd64 · bookwormFixed · Fixed:
9.0.0-1dsa · qpdf · debian · bookworm; dsa · qpdf · debian · 12
11.3.0-1+deb12u1· arm64 · bookwormFixed · Fixed:
9.0.0-1dsa · qpdf · debian · bookworm; dsa · qpdf · debian · 12
- [qpdf]Fixed
Details (2)
11.3.0-1+deb12u1· amd64 · bookwormFixed · Fixed:
9.0.0-1dsa · qpdf · debian · bookworm; dsa · qpdf · debian · 12
11.3.0-1+deb12u1· arm64 · bookwormFixed · Fixed:
9.0.0-1dsa · qpdf · debian · bookworm; dsa · qpdf · debian · 12
[Debian 13 (Trixie)]
- [libqpdf30]Fixed
Source package: [qpdf]
Details (2)
12.2.0-1· amd64 · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
12.2.0-1· arm64 · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
- [libqpdf-dev]Fixed
Source package: [qpdf]
Details (2)
12.2.0-1· amd64 · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
12.2.0-1· arm64 · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
- [qpdf]Fixed
Details (2)
12.2.0-1· amd64 · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
12.2.0-1· arm64 · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
- [qpdf-doc]Fixed
Source package: [qpdf]
Details (2)
12.2.0-1· all · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
12.2.0-1· all · trixieFixed · Fixed:
9.0.0-1dsa · qpdf · debian · 13
Observed:
References
- [https://osv.dev/vulnerability/DEBIAN-CVE-2018-18020]
- [https://osv.dev/vulnerability/DLA-3548-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2018-18020]
- [https://osv.dev/vulnerability/USN-5026-1]
- [https://osv.dev/vulnerability/USN-5026-2]
- [https://security-tracker.debian.org/tracker/CVE-2018-18020]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]