High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2018-9918
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:27 UTC · Revision 1
Source evidence
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.
osv:CVE-2018-9918
Complete source record
{
"id": "9b55797e424f7a234a84534bdb99038aec982d0916e276e781f612b0eb36a708",
"url": "https://osv.dev/vulnerability/CVE-2018-9918",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2018-9918",
"summary": "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.",
"evidence": "osv:CVE-2018-9918",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2018-9918",
"aliases": [
"CVE-2018-9918"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/qpdf/qpdf",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "f8c8e4dcc0f45779dcb93de6f417a2c189d5c157"
},
{
"fixed": "b4d6cf6836ce025ba1811b7bbec52680c7204223"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:qpdf_project:qpdf:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "8.0.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "b4d6cf6836ce025ba1811b7bbec52680c7204223"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"release-qpdf-8.0.2",
"release-qpdf-8.0.1",
"release-qpdf-8.0.0",
"release-qpdf-8.0.rc3",
"release-qpdf-8.0.rc2",
"release-qpdf-8.0.rc1",
"release-qpdf-8.0.a1",
"release-qpdf-7.1.1",
"release-qpdf-7.1.0",
"release-qpdf-7.0.0",
"release-qpdf-7.0.b1",
"release-qpdf-6.0.0",
"release-qpdf-5.2.0",
"release-qpdf-5.1.3",
"release-qpdf-5.1.2",
"release-qpdf-5.1.1",
"release-qpdf-5.1.0",
"release-qpdf-5.0.1",
"release-qpdf-5.0.0",
"release-qpdf-4.2.0",
"release-qpdf-4.1.0",
"release-qpdf-4.0.1",
"release-qpdf-4.0.0",
"release-qpdf-3.0.2",
"release-qpdf-3.0.1",
"release-qpdf-3.0.0",
"release-qpdf-3.0.rc1",
"release-qpdf-2.3.1",
"release-qpdf-2.3.0",
"release-qpdf-2.2.4",
"release-qpdf-2.2.3",
"release-qpdf-2.2.2",
"release-qpdf-2.2.1",
"release-qpdf-2.2.0",
"release-qpdf-2.2.rc1",
"release-qpdf-2.1.5",
"release-qpdf-2.1.4",
"release-qpdf-2.1.3",
"release-qpdf-2.1.2",
"release-qpdf-2.1.1",
"release-qpdf-2.1",
"release-qpdf-2.1.rc1",
"release-qpdf-2.0.6",
"release-qpdf-2.0.5",
"release-qpdf-2.0.4",
"release-qpdf-2.0.3",
"release-qpdf-2.0.2",
"release-qpdf-2.0.1",
"release-qpdf-2.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-9918.json",
"vanir_signatures": [
{
"id": "CVE-2018-9918-249879d0",
"digest": {
"threshold": 0.9,
"line_hashes": [
"181739345319500568680739432924015967377",
"106959424485635183592864499561300455322",
"33834260254958747297438551673392020084",
"172637144567233369777621291369876028934",
"16267163913427358820904854266060915297",
"75590030690278665368514097307259967412",
"111827253706210392211691782529734872093",
"207665020818809464945553329770339154989",
"304524329726436421318641378340825999579"
]
},
"source": "https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223",
"target": {
"file": "libqpdf/QPDFObjectHandle.cc"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2018-9918-9be83622",
"digest": {
"length": 7243,
"function_hash": "338132264288561279274696630611627217117"
},
"source": "https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223",
"target": {
"file": "libqpdf/QPDFObjectHandle.cc",
"function": "QPDFObjectHandle::parseInternal"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:37:09Z"
}
}
],
"modified": "2026-10-20T13:37:09.876593909Z",
"provider": "osv",
"references": [
"https://usn.ubuntu.com/3638-1/",
"https://github.com/qpdf/qpdf/commit/b4d6cf6836ce025ba1811b7bbec52680c7204223",
"https://github.com/qpdf/qpdf/issues/202"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
},
{
"introduced": "17.10"
},
{
"last_affected": "17.10"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2018-9918",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387895,
"published_at": "2018-04-10T18:29:00.45+00:00"
}