CVE-2026-109831
Deferred Deferred - Pending Action

Out-of-Bounds Write in UnRTF Leading to DoS

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: JPCERT/CC

Description
UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-08
NVD
CVE-2026-109831
EUVD
EUVD-2026-104795

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
GNU Project UnRTF 0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

UnRTF by GNU Project is vulnerable to an out-of-bounds write issue. This flaw occurs when processing RTF files. If a user opens a specially crafted RTF file from an attacker, it may cause a denial-of-service (DoS) condition by crashing the application.

Detection Guidance

To detect this vulnerability, check the installed version of UnRTF on your system. Run: unrtf --version. If the version is below 0.21.12, the system is vulnerable. Additionally, monitor for crashes or DoS conditions when processing RTF files.

Impact Analysis

This vulnerability could allow attackers to crash your UnRTF application by tricking you into opening a malicious RTF file. This may disrupt your workflow if you frequently process RTF documents. The impact is limited to DoS and does not appear to allow code execution.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it only causes a denial-of-service condition when processing a malicious RTF file. No data exposure or integrity issues are mentioned, so standard controls for availability remain the primary concern.

Mitigation Strategies

Update UnRTF to version 0.21.12 or later to address the out-of-bounds write vulnerability. Download the latest version from the official GNU Project repository or Savannah page.

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