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    CVE-2026-115352

    Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows unauthenticated attackers to exhaust CPU by submitting long runs of unmatched '[' characters. Attackers can send small markdown payloads that trigger O(N^2) parse_link_text and parse_link_label probing, occupying rendering workers for 30+ seconds per 16 KB input.

    Published:Oct 22, 2026
    Last Modified:Oct 23, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.00359
    CVSS Score:7.5

    Affected Products

    Vendor
    Mistune Project
    Product
    Mistune

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-121438 (CVSS 6.9) — Mistune before 3.3.3 contains a denial of service vulnerability in InlineParser.parse_link that allows attacke…
    CVE-2026-121437 (CVSS 8.7) — Mistune from 3.3.0 before 3.3.4 contains a denial of service vulnerability that allows remote attackers to exh…
    CVE-2026-115354 (CVSS 7.1) — Mistune before 3.3.0 contains a path traversal vulnerability in the opt-in Include directive that allows attac…
    CVE-2026-115355 (CVSS 8.7) — Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to…
    CVE-2026-115353 (CVSS 9.2) — Mistune before 3.3.0 contains a path traversal vulnerability in the RST include directive that allows attacker…
    CVE-2026-115351 (CVSS 5.3) — Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markd…
    CVE-2026-115350 (CVSS 5.3) — Mistune before 3.3.0 contains a cross-site scripting vulnerability in the Include directive that emits include…
    CVE-2026-115349 (CVSS 8.7) — Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the pars…
    CVE-2026-115348 (CVSS 8.7) — Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's p…
    CVE-2026-115347 (CVSS 8.7) — Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allo…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High