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    CVE-2026-115348

    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.

    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

    Related CVEs

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    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-2026-115352 (CVSS 8.7) — Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows un…
    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-2026-115347 (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