CVE-2026-8356
Description
A flaw was found in LibreOffice. This vulnerability, a stack buffer overflow, occurs when processing specially crafted legacy PowerPoint (PPT) files. An attacker could exploit this by convincing a user to open a malicious document, which may lead to a denial of service (DoS) due to the application crashing. This primarily affects desktop users who handle untrusted files.
Statement
This Moderate impact denial of service vulnerability in LibreOffice is due to a stack buffer overflow when parsing specially crafted legacy PowerPoint (PPT) files. Successful exploitation requires user interaction, as an attacker must persuade a user to open a malicious document. The flaw primarily affects desktop users who process untrusted files.
Mitigation
Users should exercise caution when opening untrusted or suspicious legacy PowerPoint (PPT) files. Avoid opening documents from unknown sources to prevent potential denial of service attacks. If possible, process untrusted documents in a sandboxed environment.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands; Read Memory; Modify Memory
If the incorrect calculation is used in the context of memory allocation, then the software may create a buffer that is smaller or larger than expected. If the allocated buffer is smaller than expected, this could lead to an out-of-bounds read or write (CWE-119), possibly causing a crash, allowing arbitrary code execution, or exposing sensitive data.
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