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Back to active CVEs
High · CVSS 8.7CVE-2026-115349

Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket ParsingCVE-2026-115349

Answer in brief

CVE-2026-115349 records a High severity (CVSS 8.7) vulnerability in Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing. The current sources do not mark it as known exploited. The current feed maps lepture/mistune (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps lepture/mistune (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
lepture/mistunegeneric>=3.0.0 <3.3.03.3.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for lepture/mistune.
  2. 2Review the reported fix. Update lepture/mistune to 3.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 22, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Crawl4AI 0.7.0 before 0.9.5 ReDoS via /crawl Regex FieldsAlso CWE-1333

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-1333
Source
CVE List V5
Source checked
Oct 22, 2026
References
2 linked sources
Open source record