SB2022010804 - Inefficient regular expression complexity in markdown-it

Description

This security bulletin contains information about 1 vulnerability.

1) Inefficient regular expression complexity (CVE-ID: CVE-2022-21670)

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient regular expression complexity in newline rule when parsing specially crafted markdown input. A remote attacker can send specially crafted input to cause a denial of service.

Inputs containing special patterns with lengths greater than 50,000 characters can significantly slow down the parser.

Remediation

Install update from vendor's website.

References

• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6vfc-qv3f-vr6c
• https://github.com/advisories/GHSA-6vfc-qv3f-vr6c