qpdf: stack exhaustion in QPDFObjectHandle and QPDF_Dictionary classes in libqpdf.a
Published Apr 10, 2018
7.8
HIGHCVSS 3.0
EPSS 1.67%
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.
Affected products
No data.
Configuration 1
- ≤ 8.0.2
Configuration 2
- 14.04
- 16.04
- 17.10
No data.
Red Hat Enterprise Linux 7
qpdf
Will not fix
Red Hat Enterprise Linux 8
qpdf
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | qpdf | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | qpdf | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (22 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.67% (0.01673) | 75.97th | v5 (v2026.06.15) |
| Sep 22, 2026 | 1.67% (0.01673) | 75.81th | v5 (v2026.06.15) |
| Sep 21, 2026 | 2.73% (0.02734) | 85.39th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.67% (0.01673) | 75.79th | v5 (v2026.06.15) |
| Sep 6, 2026 | 1.70% (0.01705) | 75.76th | v5 (v2026.06.15) |
| Sep 5, 2026 | 2.75% (0.02752) | 85.19th | v5 (v2026.06.15) |
| Aug 30, 2026 | 1.69% (0.01690) | 75.43th | v5 (v2026.06.15) |
| Aug 28, 2026 | 2.73% (0.02729) | 84.96th | v5 (v2026.06.15) |
| Aug 24, 2026 | 1.69% (0.01690) | 75.29th | v5 (v2026.06.15) |
| Aug 23, 2026 | 2.73% (0.02729) | 84.90th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.72% (0.01717) | 74.39th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.11% (0.00107) | 26.48th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.50% (0.00502) | 76.62th | v3 (v2023.03.01) |
| Mar 20, 2024 | 0.50% (0.00502) | 75.93th | v3 (v2023.03.01) |
| Feb 18, 2024 | 0.43% (0.00425) | 73.69th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.35% (0.00354) | 71.18th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.35% (0.00354) | 68.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.30% (0.00297) | 64.54th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.30% (0.01300) | 31.12th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.30% (0.01300) | 0.00th | v1 |
References (7)
- https://access.redhat.com/security/cve/CVE-2018-9918 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1566756 Issue Tracking
- https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223 x_refsource_MISCPatch
- https://github.com/qpdf/qpdf/issues/202 x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-9918
- https://usn.ubuntu.com/3638-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-9918
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2018-9918 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1566756 | Issue Tracking | |
| https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223 | x_refsource_MISCPatch | |
| https://github.com/qpdf/qpdf/issues/202 | x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-9918 | ||
| https://usn.ubuntu.com/3638-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-9918 |
Change history (0)
No recorded changes yet.