TI-2020-16128 Aliases CVE-2020-26307 GHSA-qmpf-c66x-m579

GHSL-2020-301: Regular Expression Denial of Service (ReDoS) in HTML2Markdown

HIGH 77CWE-1333Published 2024-10-26 · Updated 2024-10-28

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: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-1333.

Summary

HTML2Markdown is a Javascript implementation for converting HTML to Markdown text. All available versions contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00406 35th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
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
kates	html2markdown	up to 1.0.2	—	No fix listed	CNA

html2markdown Vendorkates Affected up to 1.0.2 Fixed in — No fix listed CNA

CPE names CISA-ADP · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:kates:html2markdown::::::::	—	—	kates

cpe:2.3:a:kates:html2markdown:*:*:*:*:*:*:*:* Versions — — ·kates

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-26307
2026-10-03 Alias added: GHSA-qmpf-c66x-m579

References

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences