MediumFix available
r-cran-readxl — security advisory
libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file
- Products
- r-cran-readxl
- Affected versions
- 1.4.2-1, 1.4.3-1, 1.4.4-1, 1.4.5-1, 1.5.0-1, 1.5.0.1-1, 1.6.0-1
- Fixed versions
- 1.6.0-1
- CVEs
- CVE-2026-26824
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:34 UTC · Revision 2
Source evidence
libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file
osv:DEBIAN-CVE-2026-26824
r-cran-readxl
Fixed versions: Not specified
r-cran-readxl
Fixed versions: Not specified
r-cran-readxl
Fixed versions: 1.6.0-1
Complete source record
{
"id": "3f3d831102be7d5815d81e04d9218b9007c75feb87fdc8581990577e7be99b13",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-26824",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-26824",
"summary": "libxls through version 1.6.3 contains a use of uninitialized memory vulnerability in the OLE container parser. Memory allocated for the Master Sector Allocation Table (MSAT) in read_MSAT() is not fully initialized before being consumed by ole2_validate_sector_chain(), which may result in application crashes or potential information disclosure when processing a crafted XLS file",
"evidence": "osv:DEBIAN-CVE-2026-26824",
"products": [
{
"name": {
"value": "r-cran-readxl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.0.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.6.0-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "r-cran-readxl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.0.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.6.0-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "r-cran-readxl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.6.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.4.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.5.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.5.0.1-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-26824",
"aliases": [
"DEBIAN-CVE-2026-26824"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "r-cran-readxl",
"purl": "pkg:deb/debian/r-cran-readxl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.4.2-1",
"1.4.3-1",
"1.4.4-1",
"1.4.5-1",
"1.5.0-1",
"1.5.0.1-1",
"1.6.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26824.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "r-cran-readxl",
"purl": "pkg:deb/debian/r-cran-readxl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.4.5-1",
"1.5.0-1",
"1.5.0.1-1",
"1.6.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26824.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.0-1"
}
]
}
],
"package": {
"name": "r-cran-readxl",
"purl": "pkg:deb/debian/r-cran-readxl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.4.5-1",
"1.5.0-1",
"1.5.0.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26824.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-25T05:00:06.426807899Z",
"provider": "osv",
"upstream": [
"CVE-2026-26824"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-26824"
]
},
"related_cves": [
{
"value": "CVE-2026-26824",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 444145,
"published_at": "2026-06-03T20:16:18.677+00:00"
}