league/commonmark before 2.6.0 Denial of Service via Quadratic Complexity
Priority MEDIUM 44CWE-407Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-407.
Summary
league/commonmark versions before 2.6.0 contain polynomial time complexity vulnerabilities in Markdown parsing that allow attackers to cause denial of service. Attackers can submit carefully crafted Markdown inputs designed to trigger worst-case performance, and sending multiple requests in parallel exhausts CPU resources and PHP-FPM processes.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00488 42nd percentileScored 2026-11-07
Fix Fixed commonmark (thephpleague): 2.6.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| thephpleague | commonmark | before 2.6.0 | 2.6.0 | Patch available | CNA |
- commonmark Vendorthephpleague Affected before 2.6.0 Fixed in 2.6.0 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:* | — | — | thephpleague |
- cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:* Versions — — ·thephpleague
Remediation
- Fix · CNA commonmark (thephpleague) Fixed in 2.6.0
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2024-58382
- 2026-10-03 Alias added: GHSA-fv22-86fq-c33q
References
More thephpleague vulnerabilities
- TI-2026-69535 league/commonmark Quadratic DoS via TableStartParser CVSS 4.0HIGH 8.7
- TI-2026-50093 league/commonmark: AttributesExtension href/src unsafe-link filter bypass via embedded control bytes CVSS 3.1MEDIUM 6.1
- TI-2026-69534 Cross-site scripting in League CommonMark bypasses DisallowedRawHtml CVSS 4.0MEDIUM 5.3
- TI-2026-65445 Flysystem: WhitespacePathNormalizer's control-character (CorruptedPathDetected) check is… CVSS 3.1LOW 3.5
- TI-2021-12376 Time-of-check Time-of-use (TOCTOU) Race Condition in league/flysystem CVSS 3.1CRITICAL 9.8
- TI-2026-59143 commonmark 1.5.0 before 2.8.4 Denial of Service via Footnote CVSS 4.0HIGH 8.7
Sources
- CVE-2024-58382 · CVE Program
- CVE-2024-58382 · NVD
- FIRST EPSS
- GHSA-fv22-86fq-c33q · GitHub Advisory Database · CC BY 4.0
- CVE-2024-58382 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences