Vulnerability · Published Oct 20, 2026 · Assigned by jpcert
CVE-2026-109831
Medium 5.4
In plain English
A medium-severity out-of-bounds write in UnRTF from GNU Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.0)5.4Medium
Exploit odds (30 days)0.2%top 89.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | unrtf | no fix listed | DEBIAN-CVE-2026-109831 |
| Debian:13 | unrtf | no fix listed | DEBIAN-CVE-2026-109831 |
| Debian:14 | unrtf | 0.21.13-1 | DEBIAN-CVE-2026-109831 |
| Ubuntu:22.04:LTS | unrtf | no fix listed | UBUNTU-CVE-2026-109831 |
| Ubuntu:24.04:LTS | unrtf | no fix listed | UBUNTU-CVE-2026-109831 |
| Ubuntu:26.04:LTS | unrtf | no fix listed | UBUNTU-CVE-2026-109831 |
| Ubuntu:26.10 | unrtf | no fix listed | UBUNTU-CVE-2026-109831 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GNU Project | UnRTF | 0 – before 0.21.12 |
Weakness: CWE-787 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L