Uncontrolled resource consumption in arasatasaygin is.js
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 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever." This vulnerability was found using a CodeQL query which identifies inefficient regular expressions. is.js has no patch for this issue.
Why it matters now
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 |
|---|---|---|---|---|---|
| arasatasaygin | is.js | 0.9.0 – 0.9.0 | — | No fix listed | CNA |
| — | is_js (npm) | up to 0.9.0 | — | No fix listed | GHSA-pvrw-g6fx-mcx2 |
- is.js Vendorarasatasaygin Affected 0.9.0 – 0.9.0 Fixed in — No fix listed CNA
- is_js (npm) Vendor— Affected up to 0.9.0 Fixed in — No fix listed GHSA-pvrw-g6fx-mcx2
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:is.js_project:is.js:*:*:*:*:*:*:*:* | up to 0.9.0 | Vulnerable | Is.js Project |
- cpe:2.3:a:is.js_project:is.js:*:*:*:*:*:*:*:* Versions up to 0.9.0 Vulnerable ·Is.js Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-26302
- 2026-10-03 Alias added: GHSA-pvrw-g6fx-mcx2
References
Sources
- CVE-2020-26302 · CVE Program
- CVE-2020-26302 · NVD
- FIRST EPSS
- GHSA-pvrw-g6fx-mcx2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences