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CVE-2026-115354— Mistune before 3.3.0 Arbitrary Local File Read via Include Directive

Quick assessment

Affected
lepture mistune
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.

Mistune 3.3.0 之前的版本在其可选的 Include 指令中存在路径遍历漏洞。攻击者可通过提供相对或绝对包含路径，读取本地文件。若攻击者提交经由 渲染的 Markdown 内容，即可泄露如 等文件，并将未经转义的 HTML 或脚本内容注入到渲染后的输出中。

CVSS 6.5 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
lepture mistune < 3.3.0 affected
3.3.0 unaffected
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I. Basic Information for CVE-2026-115354

Vulnerability Information
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Vulnerability Title
Mistune before 3.3.0 Arbitrary Local File Read via Include Directive
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune before 3.3.0 contains a path traversal vulnerability in the opt-in Include directive that allows attackers to read local files by supplying relative or absolute include paths. Attackers who submit Markdown rendered via Markdown.read() can disclose files such as /etc/passwd and inject unescaped HTML or script content into rendered output.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
lepture mistune 0 ~ 3.3.0 -

II. Public POCs for CVE-2026-115354

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III. Intelligence Information for CVE-2026-115354

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Other References for CVE-2026-115354 (2)

Same Patch Batch · lepture · 2026-10-22 · 9 CVEs total

CVE-2026-115353 8.6 HIGH Mistune before 3.3.0 Path Traversal via include Directive
CVE-2026-115349 7.5 HIGH Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing
CVE-2026-115352 7.5 HIGH Mistune before 3.3.0 Quadratic-Time DoS via Unmatched Brackets in Inline Parser
CVE-2026-115348 7.5 HIGH Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
CVE-2026-115347 7.5 HIGH Mistune before 3.3.0 Quadratic Denial of Service via parse_link_text
CVE-2026-115355 7.5 HIGH Mistune before 3.3.0 Path Traversal and XSS via Include Directive
CVE-2026-115350 6.1 MEDIUM Mistune before 3.3.0 Stored XSS via Include Directive HTML Files
CVE-2026-115351 4.7 MEDIUM Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option

IV. Related Vulnerabilities

Same product: mistune
Same vendor: lepture
Same weakness: CWE-22

V. Comments for CVE-2026-115354

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