CVE-2026-109831

Out-of-bounds write in GNU Project UnRTF

CVSS score

5.4

EPSS probability

—

Risk score

0.5

Published

3 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

Out-of-bounds write in GNU UnRTF (CVE-2026-109831)

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

GNU Project's UnRTF suffers an out-of-bounds write (CVE-2026-109831) when a crafted RTF file is opened, potentially causing a denial‑of‑service condition.

Why does it matter?

DoS can disrupt services, degrading user experience and system reliability.

What should be done?

Patch status UNKNOWN; monitor official advisories
Track updates and security announcements for UnRTF
Restrict opening of untrusted RTF files

Chain of evidence and sources3 verified claims

CVE-2026-109831, GNU Project UnRTF'de 0 < 0.21.12 sürümlerini etkileyen bir out-of-bounds write hatasıdır ve kötü amaçlı RTF dosyalarıyla hizmet reddi (DoS) oluşturabilir.

S0 · daybreach-canonical S1 · cvelist

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S0 · daybreach-canonical

Yama durumu UNKNOWN olarak rapor edilmiştir; resmi kaynaklarda düzeltme sürümü belirtilmemiştir.

S0 · daybreach-canonical

Show the technical text 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.

CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

CWE: CWE-787

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-109831 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	GNU Project	UnRTF	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
5.4	CVSS V30	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L	NVD
5.4	CVSS V3_0	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L	CVE CNA
5.1	CVSS V40	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD
5.1	CVSS V4_0	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-109831 is associated with the following CWEs:

CWE-787: Out-of-bounds Write

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-109831 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekiyor

Official Sources and Advisories

https://savannah.gnu.org/news/?id=10925vendor-advisory https://jvn.jp/en/jp/JVN29783594/vendor-advisory

CVSS Vector Radar Chart

5.4 / 10

Vulnerability Scoring Details

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User Interaction—

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)Low

Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

GNU Project

Weakness Type (CWE & CAPEC)

CWE-787

Get this vulnerability through the API

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