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Vulnerability · Published Jun 3, 2026 · Assigned by mitre

CVE-2026-26825

Medium 5.3

In plain English

A medium-severity security flaw in the r-cran-readxl package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 84.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12r-cran-readxlno fix listedDEBIAN-CVE-2026-26825
Debian:13r-cran-readxlno fix listedDEBIAN-CVE-2026-26825
Debian:14r-cran-readxl1.6.0-1DEBIAN-CVE-2026-26825
Ubuntu:22.04:LTSr-cran-readxlno fix listedUBUNTU-CVE-2026-26825
Ubuntu:24.04:LTSr-cran-readxlno fix listedUBUNTU-CVE-2026-26825
Ubuntu:25.10r-cran-readxlno fix listedUBUNTU-CVE-2026-26825
Ubuntu:26.04:LTSr-cran-readxlno fix listedUBUNTU-CVE-2026-26825
Ubuntu:26.10r-cran-readxlno fix listedUBUNTU-CVE-2026-26825

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-908 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References