Platform
linux
Component
r-project
Fixed in
3.5.1
CVE-2019-25656 describes a buffer overflow vulnerability found in R i386 version 3.5.0. This flaw allows a local attacker to trigger a structured exception handler (SEH) overwrite, potentially leading to arbitrary code execution. The vulnerability stems from insufficient input validation within the GUI Preferences dialog, specifically the 'Language for menus and messages' field. While a direct patch is the preferred solution, mitigation strategies can be implemented to reduce the risk.
An attacker exploiting CVE-2019-25656 can gain complete control over the affected system. By crafting a malicious payload string within the 'Language for menus and messages' field of the GUI Preferences dialog, they can overwrite SEH records. This overwrite allows the attacker to redirect execution flow to arbitrary code, effectively achieving code execution with calculator privileges or even gaining a shell. The impact is significant, as it allows for complete system compromise from a local attacker. The vulnerability's reliance on user interaction within the GUI makes it less likely to be exploited remotely, but it presents a serious risk in environments where local access is possible.
CVE-2019-25656 was published on 2026-04-05. There is no indication of this CVE being added to the CISA KEV catalog or any public proof-of-concept exploits being available. The vulnerability's local nature and reliance on user interaction likely contribute to its relatively low exploitation probability. The EPSS score is likely low, reflecting the limited attack surface and lack of public exploit code.
Exploit Status
EPSS
0.02% (4% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2019-25656 is to upgrade to a patched version of R i386. Unfortunately, a specific fixed version is not provided in the CVE data. As a workaround, restrict user input within the 'Language for menus and messages' field to prevent excessively long strings. Implement input validation to ensure the length and format of the input conform to expected values. Monitor system logs for suspicious activity, particularly related to the GUI Preferences dialog and SEH exceptions. Consider using a security information and event management (SIEM) system to correlate events and detect potential exploitation attempts. After upgrade (if available), confirm by attempting to trigger the vulnerability with a known malicious payload and verifying that it fails.
Update to a patched version of R i386 that addresses the buffer overflow vulnerability. Refer to the R project website for more information on available updates: https://www.r-project.org/
Vulnerability analysis and critical alerts directly to your inbox.
CVE-2019-25656 is a buffer overflow vulnerability in R i386 3.5.0 that allows a local attacker to trigger an SEH overwrite by supplying malicious input in the 'Language for menus and messages' field, potentially leading to code execution.
If you are running R i386 version 3.5.0, you are potentially affected. Upgrade to a patched version as soon as possible.
The recommended fix is to upgrade to a patched version of R i386. If a patch is unavailable, restrict user input and monitor system logs for suspicious activity.
There is currently no public evidence of CVE-2019-25656 being actively exploited, but the potential for exploitation remains due to the vulnerability's severity.
Refer to the official R project website and security mailing lists for updates and advisories related to CVE-2019-25656.
Upload your dependency file and we'll tell you instantly if this and other CVEs hit you.