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Vulnerability · Published Jun 3, 2026 · Assigned by mitre

CVE-2026-26824

Medium 6.5

In plain English

A medium-severity security flaw in the r-cran-readxl package (Debian). Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 80.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12r-cran-readxlno fix listedDEBIAN-CVE-2026-26824
Debian:13r-cran-readxlno fix listedDEBIAN-CVE-2026-26824
Debian:14r-cran-readxl1.6.0-1DEBIAN-CVE-2026-26824
Ubuntu:22.04:LTSr-cran-readxlno fix listedUBUNTU-CVE-2026-26824
Ubuntu:24.04:LTSr-cran-readxlno fix listedUBUNTU-CVE-2026-26824
Ubuntu:25.10r-cran-readxlno fix listedUBUNTU-CVE-2026-26824
Ubuntu:26.04:LTSr-cran-readxlno fix listedUBUNTU-CVE-2026-26824
Ubuntu:26.10r-cran-readxlno fix listedUBUNTU-CVE-2026-26824

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-457 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

References