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CVE-2026-115355— Mistune before 3.3.0 Path Traversal and XSS 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 Include 指令中存在路径遍历漏洞，攻击者可通过在包含路径中提供 序列来读取任意文件。此外，攻击者还可利用未转义的错误消息及所包含文件的内容注入 HTML，从而实施跨站脚本（XSS）攻击，即使已设置 也无法防御。

CVSS 7.5 · High

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-2026-115355

Vulnerability Information
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Vulnerability Title
Mistune before 3.3.0 Path Traversal and XSS via Include Directive
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read arbitrary files by supplying ../ sequences in include paths. Attackers can also inject HTML through unescaped error messages and included file contents to perform cross-site scripting even when escape=True is set.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-2026-115355

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III. Intelligence Information for CVE-2026-115355

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Other References for CVE-2026-115355 (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-2026-115354 6.5 MEDIUM Mistune before 3.3.0 Arbitrary Local File Read 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-2026-115355

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