High
pymupdf — security advisory
PyMuPDF through 1.28.2, fixed in commit b2c8f3a, contains a path traversal vulnerability in the font branch of extract_objects() in src/__main__.py, where the output filename is constructed by joining a document-controlled BaseFont name directly onto the user-supplied output directory without stripping path separators or dot-dot sequences. Attackers can supply a crafted PDF, EPUB, XPS, or FB2 file with a BaseFont name containing encoded path separators that decode to ../ sequences or absolute paths, causing arbitrary file writes outside the intended output directory without requiring authentication or elevated privileges.
- Products
- pymupdf
- Affected versions
- 1.16.11-1, 1.17.4+ds1-2build2, 1.17.4+ds1-2build3, 1.19.2+ds1-1ubuntu1, 1.22.5+ds1-1, 1.22.5+ds1-1build1, 1.22.5+ds1-1build2, 1.23.7+ds1-1ubuntu1, 1.23.7+ds1-1ubuntu2, 1.25.4+ds1-4, 1.26.7+ds1-1, 1.26.7+ds1-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-82035
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:20 UTC · Revision 1
Source evidence
PyMuPDF through 1.28.2, fixed in commit b2c8f3a, contains a path traversal vulnerability in the font branch of extract_objects() in src/__main__.py, where the output filename is constructed by joining a document-controlled BaseFont name directly onto the user-supplied output directory without stripping path separators or dot-dot sequences. Attackers can supply a crafted PDF, EPUB, XPS, or FB2 file with a BaseFont name containing encoded path separators that decode to ../ sequences or absolute paths, causing arbitrary file writes outside the intended output directory without requiring authentication or elevated privileges.
osv:UBUNTU-CVE-2026-82035
pymupdf
Fixed versions: Not specified
pymupdf
Fixed versions: Not specified
pymupdf
Fixed versions: Not specified
pymupdf
Fixed versions: Not specified
pymupdf
Fixed versions: Not specified
Complete source record
{
"id": "fc9833a07102135626ea8d64a2015940c110a4ad11ccb47ff29b3cc491a7b725",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-82035",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-82035",
"summary": "PyMuPDF through 1.28.2, fixed in commit b2c8f3a, contains a path traversal vulnerability in the font branch of extract_objects() in src/__main__.py, where the output filename is constructed by joining a document-controlled BaseFont name directly onto the user-supplied output directory without stripping path separators or dot-dot sequences. Attackers can supply a crafted PDF, EPUB, XPS, or FB2 file with a BaseFont name containing encoded path separators that decode to ../ sequences or absolute paths, causing arbitrary file writes outside the intended output directory without requiring authentication or elevated privileges.",
"evidence": "osv:UBUNTU-CVE-2026-82035",
"products": [
{
"name": {
"value": "pymupdf",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.16.11-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
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"prerequisites": [],
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"affected_versions": [
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
"value": "1.23.7+ds1-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
}
]
},
{
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"affected_versions": [
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"evidence": "/affected/3/versions"
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},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
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"evidence": "/affected/4/versions"
},
{
"value": "1.26.7+ds1-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.26.7+ds1-1build1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-82035",
"aliases": [
"UBUNTU-CVE-2026-82035"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
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],
"package": {
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"purl": "pkg:deb/ubuntu/pymupdf?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.16.11-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-82035.json"
},
"ecosystem_specific": {
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{
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"ecosystem": "Ubuntu:22.04:LTS"
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1.22.5+ds1-1",
"1.22.5+ds1-1build1",
"1.22.5+ds1-1build2",
"1.23.7+ds1-1ubuntu1",
"1.23.7+ds1-1ubuntu2"
],
"database_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/pymupdf?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.26.7+ds1-1build1"
],
"database_specific": {
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"ecosystem_specific": {
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},
{
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"package": {
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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{
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]
}
}
],
"modified": "2026-10-17T13:01:11.121175323Z",
"provider": "osv",
"upstream": [
"CVE-2026-82035"
],
"references": [
"https://ubuntu.com/security/CVE-2026-82035",
"https://www.cve.org/CVERecord?id=CVE-2026-82035"
]
},
"related_cves": [
{
"value": "CVE-2026-82035",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361161,
"published_at": "2026-09-14T19:17:00+00:00"
}