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CVE-2026-115348— Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text

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 3.0.0 至 3.3.0 版本（不含 3.3.0）的 inline 链接解析器中的 函数存在算法复杂度漏洞。该漏洞允许未认证攻击者通过提交包含大量不匹配左方括号 或感叹号左方括号 的 Markdown 内容，触发重复且无界的前向扫描，从而耗尽 CPU 资源并导致工作进程被长时间占用（可达数分钟）。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
lepture mistune 3.0.0< 3.3.0 affected
3.3.0 unaffected
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I. Basic Information for CVE-2026-115348

Vulnerability Information
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Vulnerability Title
Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's parse_link_text function that allows unauthenticated attackers to exhaust CPU with unbalanced brackets. Attackers can submit Markdown containing many unbalanced '[' or '![' characters, forcing repeated unbounded forward scans and tying up worker processes for minutes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lepture mistune 3.0.0 ~ 3.3.0 -

II. Public POCs for CVE-2026-115348

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III. Intelligence Information for CVE-2026-115348

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Vendor Advisories for CVE-2026-115348 (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-2026-115347 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-2026-115354 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-400

V. Comments for CVE-2026-115348

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