CVE-2026-61632
Description
A flaw was found in PyMdown Extensions. The b64 extension, used for inlining images in Markdown, is vulnerable to a path traversal issue. An attacker can craft untrusted Markdown with specially formed image source (<img src="...">) containing directory traversal sequences (e.g., ../) or absolute paths. This allows the attacker to read and disclose the contents of arbitrary files on the system, provided they have an allowed image extension, leading to information disclosure.
Statement
Moderate: This flaw in PyMdown Extensions allows information disclosure via path traversal when the b64 extension is enabled in applications processing untrusted Markdown. An attacker can craft malicious image references to read arbitrary files with specific extensions from the system. The impact is limited to files readable by the process and requires the b64 extension to be active.
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 | 5.3 | N/A | 5.3 |
| 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 | Low | N/A | Low |
| 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:L/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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