uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of…
Priority LOW 35CWE-674Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-674.
Summary
uBlock Origin before 1.36.2 and nMatrix before 4.4.9 support an arbitrary depth of parameter nesting for strict blocking, which allows crafted web sites to cause a denial of service (unbounded recursion that can trigger memory consumption and a loss of all blocking functionality).
Why it matters now
EPSS 0.01261 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sciruby:nmatrix:*:*:*:*:*:*:*:* | before 4.4.9 | Vulnerable | Sciruby |
| cpe:2.3:a:ublockorigin:ublock_origin:*:*:*:*:*:*:*:* | before 1.36.2 | Vulnerable | Ublockorigin |
| cpe:2.3:a:umatrix_project:umatrix:*:*:*:*:*:*:*:* | before 1.4.2 | Vulnerable | Umatrix Project |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:sciruby:nmatrix:*:*:*:*:*:*:*:* Versions before 4.4.9 Vulnerable ·Sciruby
- cpe:2.3:a:ublockorigin:ublock_origin:*:*:*:*:*:*:*:* Versions before 1.36.2 Vulnerable ·Ublockorigin
- cpe:2.3:a:umatrix_project:umatrix:*:*:*:*:*:*:*:* Versions before 1.4.2 Vulnerable ·Umatrix Project
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36773
- 2026-10-03 Alias added: GHSA-vgm6-c9jx-rm2c
References
Sources
- CVE-2021-36773 · CVE Program
- CVE-2021-36773 · NVD
- FIRST EPSS
- GHSA-vgm6-c9jx-rm2c · GitHub Advisory Database · CC BY 4.0
- CVE-2021-36773 · 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