What is CVE-2026-109831?

CVE-2026-109831 is a medium-severity vulnerability in GNU Project Unrtf, classified under Out-of-bounds Write. CVSS score: 5.4/10. Published 2026-10-20.

How severe is CVE-2026-109831?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Buffer overflow in GNU Project Unrtf

CVE-2026-109831

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.

Vulnerability class: Buffer Overflow

Published 2026-10-20.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

GNU Project Unrtf

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

savannah.gnu.org/news/
jvn.jp/en/jp/JVN29783594/

Frequently asked questions

What is CVE-2026-109831?: CVE-2026-109831 is a medium-severity vulnerability in GNU Project Unrtf, classified under Out-of-bounds Write. CVSS score: 5.4/10. Published 2026-10-20.
How severe is CVE-2026-109831?: Medium severity. CVSS v3 base score is 5.4 out of 10.