CVE catalog

CVE-2026-79591

A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.

[CVE catalog]

Severity
High · CVSS 7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.17% · Oct 25, 2026

A heap-buffer-overflow and use-after-free vulnerability exists in the xls_getCSS() function of libxls 1.6.3 due to insufficient validation of a file-controlled font index.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianr-cran-readxlsid1.6.0-1fixed
Debianr-cran-readxlforky1.6.0-1fixed
Debianr-cran-readxltrixie1.4.5-1vulnerable
Debianr-cran-readxlbookworm1.4.2-1vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianr-cran-readxlsourcesid1.6.0-1not yet assignedNot reported[1147420]
Debianr-cran-readxlsourceforky1.6.0-1not yet assignedNot reported[1147420]
Debianr-cran-readxlsourcetrixie(unfixed)not yet assignedNot reported[1147420]
Debianr-cran-readxlsourcebookworm(unfixed)not yet assignedNot reported[1147420]

[Debian bug #1147420]

Notes

[trixie] r-cran-readxl: Minor issue [bookworm] r-cran-readxl: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [r-cran-readxl]Affected
    Details (2)

    • 1.4.2-1 · amd64 · bookworm

      Affected

      nvd · r-cran-readxl · debian · bookworm; nvd · r-cran-readxl · debian · 12

    • 1.4.2-1 · arm64 · bookworm

      Affected

      nvd · r-cran-readxl · debian · bookworm; nvd · r-cran-readxl · debian · 12

[Debian 13 (Trixie)]

  • [r-cran-readxl]Affected
    Details (2)

    • 1.4.5-1 · amd64 · trixie

      Affected

      nvd · r-cran-readxl · debian · 13

    • 1.4.5-1 · arm64 · trixie

      Affected

      nvd · r-cran-readxl · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]