---
id: "CVE-2026-109831"
kind: "vulnerability"
aliases: ["CVE-2026-109831"]
title: "UnRTF: out-of-bounds write lets a crafted RTF file crash it"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["document-conversion", "linux", "package", "unrtf"]
not_affected_if: ["no-untrusted-rtf"]
published_at: "2026-10-20T05:16:53+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-25T04:16:38+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109831", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# UnRTF: out-of-bounds write lets a crafted RTF file crash it

UnRTF, the GNU RTF-to-text converter, has an out-of-bounds write triggered when it parses an attacker-crafted RTF file. The sources say a user opening such a file may hit a denial-of-service condition.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `unrtf --version` to see the installed version; the sources do not name the affected range.
- Check whether any pipeline or service converts untrusted RTF files with unrtf.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109831

## From the sources

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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