CVE-2026-115355
Description
A flaw was found in Mistune. A remote attacker can exploit a path traversal vulnerability in the Include directive by supplying manipulated file paths to access and read arbitrary files on the system. Furthermore, an attacker can inject malicious content through unescaped error messages and included files, potentially leading to cross-site scripting (XSS).
Statement
This vulnerability is rated as Important because remote attackers can potentially read sensitive local system files without authentication if an application parses untrusted Markdown using Mistune's include extension. Within supported Red Hat offerings, including OpenShift Container Platform and OpenShift AI, Mistune is embedded as a supporting library where directives are not enabled by default. Successful exploitation requires an application to explicitly enable directive handling on untrusted input, limiting exposure to custom or non-default processing pipelines.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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 | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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