MediumFix available
r-cran-readxl — security advisory
A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.
- 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-2026-26825
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:34 UTC · Revision 2
Source evidence
A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.
osv:DEBIAN-CVE-2026-26825
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": "cad9d17c86723264dd9439dc5e2decdc0c02251cc1477f840b8832b8e4f92898",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-26825",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-26825",
"summary": "A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files. The issue is reachable via xls_parseWorkBook() and is triggered by uninitialized heap memory originating from the OLE layer (ole2_read). The flaw is detectable with MemorySanitizer (MSAN) and can lead to undefined behavior, incorrect parsing logic, or potential information disclosure.",
"evidence": "osv:DEBIAN-CVE-2026-26825",
"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"
},
{
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"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"
}
]
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{
"name": {
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{
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{
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},
{
"name": {
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"evidence": "/affected/2/package/name"
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"evidence": "/affected/2/ranges"
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{
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"evidence": "/affected/2/versions"
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{
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},
{
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],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-26825",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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"package": {
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"purl": "pkg:deb/debian/r-cran-readxl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"1.4.4-1",
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26825.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
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}
],
"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-2026-26825.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
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"events": [
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],
"package": {
"name": "r-cran-readxl",
"purl": "pkg:deb/debian/r-cran-readxl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26825.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-25T05:00:06.422391641Z",
"provider": "osv",
"upstream": [
"CVE-2026-26825"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-26825"
]
},
"related_cves": [
{
"value": "CVE-2026-26825",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 444144,
"published_at": "2026-06-03T20:16:18.797+00:00"
}