MediumFix available
qpdf — security advisory
QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.
- Products
- qpdf
- Affected versions
- Not specified
- Fixed versions
- 10.1.0-1
- CVEs
- CVE-2021-36978
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:50 UTC · Revision 1
Source evidence
QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.
osv:DEBIAN-CVE-2021-36978
qpdf
Fixed versions: 10.1.0-1
qpdf
Fixed versions: 10.1.0-1
qpdf
Fixed versions: 10.1.0-1
Complete source record
{
"id": "43ae33254a097b231b4276a033ed0074943f15e4eeb3d8ab4e7abf36eb2f8fc1",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-36978",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-36978",
"summary": "QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.",
"evidence": "osv:DEBIAN-CVE-2021-36978",
"products": [
{
"name": {
"value": "qpdf",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "10.1.0-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "qpdf",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "10.1.0-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "qpdf",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "10.1.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2021-36978",
"aliases": [
"DEBIAN-CVE-2021-36978"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.1.0-1"
}
]
}
],
"package": {
"name": "qpdf",
"purl": "pkg:deb/debian/qpdf?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-36978.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.1.0-1"
}
]
}
],
"package": {
"name": "qpdf",
"purl": "pkg:deb/debian/qpdf?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-36978.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "10.1.0-1"
}
]
}
],
"package": {
"name": "qpdf",
"purl": "pkg:deb/debian/qpdf?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-36978.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:03:49.798621534Z",
"provider": "osv",
"upstream": [
"CVE-2021-36978"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-36978"
]
},
"related_cves": [
{
"value": "CVE-2021-36978",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 422392,
"published_at": "2021-07-20T07:15:08.03+00:00"
}