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GHSA-x4hg-hfwf-p9mw

MediumCVSS 6.9 / 10
Published Jul 2, 2026·Last modified Jul 2, 2026
Affected Components(0)

No affected components available

Description

Summary

The HTMLInputElement.checkValidity() method constructed a RegExp directly from the user-controlled pattern property without any sanitization or timeout protection. This allowed an attacker to inject a regex with catastrophic backtracking, freezing the event loop.

Fix

Fixed in commit https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b on main. Added:

  • Pattern length limit (1024 characters)
  • Nested quantifier detection (hasNestedQuantifiers) that rejects patterns like (a+)+ before constructing the regex
  • Patterns exceeding limits are treated as non-matching (safe default)
Risk Scores
Base Score
6.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
2.7

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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