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Vulnerability record · CVE-2019-25656 · published 5 April 2026

CVE-2019-25656: Out-of-bounds write vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.16% · top 95.6% CWE-787 · Out-of-bounds write Deferred
8.6CVSS 4.0 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
24 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://cran.r-project.org/bin/windows/base/old/3.5.0/R-3.5.0-win.exe
https://www.exploit-db.com/exploits/46288
https://www.r-project.org/
https://www.vulncheck.com/advisories/r-i386-local-buffer-overflow-seh

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Source: NIST National Vulnerability Database (record CVE-2019-25656), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.