Description
R i386 3.5.0 contains a local buffer overflow vulnerability in the GUI Preferences dialog that allows local attackers to trigger a structured exception handler (SEH) overwrite by supplying malicious input. Attackers can craft a payload string in the 'Language for menus and messages' field to overwrite SEH records and achieve code execution with calculator or arbitrary shellcode.
Published: 2026-04-05
Score: 8.6 High
EPSS: < 1% Very Low
KEV: No
Impact: Local Code Execution
Action: Immediate Patch
AI Analysis

Impact

The flaw is a local buffer overflow in the Windows GUI Preferences dialog of R i386 3.5.0. By supplying a crafted string in the 'Language for menus and messages' field, a local attacker can overwrite Structured Exception Handler (SEH) records and trigger arbitrary code execution such as launching a calculator or injecting shellcode. This weakness corresponds to CWE‑787, where a program writes beyond the bounds of a buffer.

Affected Systems

The vulnerability affects the R i386 implementation of the R Project, specifically the 3.5.0 release compiled for Windows. No other product versions or vendors are listed in the CNA data for this advisory.

Risk and Exploitability

The CVSS score of 8.6 classifies the defect as high severity. The EPSS score is not provided and the vulnerability is not listed in the CISA KEV catalog, yet a public exploit is available. Exploitation requires local access to the machine and the ability to launch the affected application; if a standard user can run R, code execution is possible, potentially leading to system compromise.

Generated by OpenCVE AI on April 5, 2026 at 23:53 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest R i386 package that contains a patch for this buffer overflow or upgrade to a newer release such as 3.5.1 or later.

Generated by OpenCVE AI on April 5, 2026 at 23:53 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 07 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared R-project
R-project r
Vendors & Products R-project
R-project r

Mon, 06 Apr 2026 20:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Sun, 05 Apr 2026 20:45:00 +0000

Type Values Removed Values Added
Description R i386 3.5.0 contains a local buffer overflow vulnerability in the GUI Preferences dialog that allows local attackers to trigger a structured exception handler (SEH) overwrite by supplying malicious input. Attackers can craft a payload string in the 'Language for menus and messages' field to overwrite SEH records and achieve code execution with calculator or arbitrary shellcode.
Title R i386 3.5.0 Local Buffer Overflow SEH
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 8.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

R-project R
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-04-06T18:30:46.713Z

Reserved: 2026-04-05T12:42:35.055Z

Link: CVE-2019-25656

cve-icon Vulnrichment

Updated: 2026-04-06T18:30:36.150Z

cve-icon NVD

Status : Deferred

Published: 2026-04-05T21:16:42.173

Modified: 2026-04-16T16:15:56.380

Link: CVE-2019-25656

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-06T21:56:21Z

Weaknesses