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CVE-2026-61632— PyMdown Extensions: Path traversal in the b64 extension lets <img src> read files outside base_path

Quick assessment

Affected
facelessuser pymdown-extensions
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

facelessuser PyMdown Extensions是facelessuser个人开发者开源的一个PythonMarkdown扩展集合。 Isaac Muse PyMdown Extensions 10.21.3及之前版本存在路径遍历漏洞，该漏洞源于b64扩展在拼接文件路径时未验证解析后的路径是否位于base_path内，可能导致攻击者读取base_path之外的任意图片文件并造成信息泄露。

CVSS 5.3 · Medium EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
facelessuser pymdown-extensions < 11.0 affected
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I. Basic Information for CVE-2026-61632

Vulnerability Information
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Vulnerability Title
PyMdown Extensions: Path traversal in the b64 extension lets <img src> read files outside base_path
Source: CVE Program / CVE List V5
Vulnerability Description
PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. In versions up to and including 10.21.3, the b64 extension is vulnerable to a path traversal that discloses arbitrary files: it inlines images referenced by <img src="..."> by joining the src onto the configured base_path with os.path.normpath and opening the result directly, without verifying that the resolved path stays inside base_path. As a result, an src containing ../ sequences or an absolute path reads a file outside base_path as long as it has an allowed image extension (.png, .jpg, .jpeg, .gif, .svg), and the file's contents are then base64-encoded into the rendered output, disclosing them. An application that renders untrusted Markdown with pymdownx.b64 enabled can therefore leak the contents of image-extension files readable by the process to whoever controls the Markdown or views the output, a targeted file-read bounded by the extension check. This issue has been fixed in version 11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Isaac Muse PyMdown Extensions 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
facelessuser PyMdown Extensions是facelessuser个人开发者开源的一个PythonMarkdown扩展集合。 Isaac Muse PyMdown Extensions 10.21.3及之前版本存在路径遍历漏洞，该漏洞源于b64扩展在拼接文件路径时未验证解析后的路径是否位于base_path内，可能导致攻击者读取base_path之外的任意图片文件并造成信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
facelessuser pymdown-extensions < 11.0 -

II. Public POCs for CVE-2026-61632

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III. Intelligence Information for CVE-2026-61632

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Vendor Advisories for CVE-2026-61632 (1)

Vendor Pages for CVE-2026-61632 (1)

IV. Related Vulnerabilities

Same product: pymdown-extensions
Same vendor: facelessuser
Same weakness: CWE-22

V. Comments for CVE-2026-61632

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