UBUNTU-CVE-2026-26824 (CVE-2026-26824)
Vulnerability from osv_ubuntu – Published: 2026-06-03 20:16 – Updated: 2026-06-11 13:03 – Source website
VLAI
Details
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
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "0.1.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@0.1.0-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "1.0.0-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@1.0.0-2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0-1build1",
"1.0.0-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "1.3.1-2build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@1.3.1-2build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.1-2",
"1.3.1-2build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "1.3.1-2build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@1.3.1-2build2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.1-2build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "1.4.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@1.4.3-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "1.4.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@1.4.5-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.5-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "r-cran-readxl",
"binary_version": "1.4.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "r-cran-readxl",
"purl": "pkg:deb/ubuntu/r-cran-readxl@1.4.5-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.5-1"
]
}
],
"aliases": [],
"details": "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",
"id": "UBUNTU-CVE-2026-26824",
"modified": "2026-06-11T13:03:38Z",
"published": "2026-06-03T20:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-26824"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-26824"
},
{
"type": "REPORT",
"url": "https://github.com/libxls/libxls/issues/155"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-26824"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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