GHSA-x4hg-hfwf-p9mw
@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation
GHSA-x4hg-hfwf-p9mw is a medium vulnerability (CVSS 6.9) in @asymmetric-effort/nogginlessdom, published July 2, 2026. No source lists public exploit code. Fixed in @asymmetric-effort/nogginlessdom 0.0.22.
- Severity
- 6.9 MediumCVSS 4.0, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
0.0.22@asymmetric-effort/nogginlessdom +1 more
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)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@asymmetric-effort/nogginlessdomnpm | through 0.0.21 | 0.0.22 |
@asymmetric-effort/nogginlessdomnpm | before 0.0.22 | 0.0.22 |
What each source reports
GitHub Advisories Score used
@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation
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)
- Record
GHSA-x4hg-hfwf-p9mw- CVSS 4.0
- 6.9 Medium
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 - Weakness
- CWE-1333
- Updated
- 2026-11-02
OSV
@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation
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)
- Record
GHSA-x4hg-hfwf-p9mw- CVSS 4.0
- 6.9 Medium
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 - Weakness
- CWE-1333
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.