GHSL-2020-289: Regular Expression Denial of Service (ReDoS) in insane
Priority HIGH 77CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
insane is a whitelist-oriented HTML sanitizer. Versions 2.6.2 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00539 45th 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
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 |
|---|---|---|---|---|---|
| bevacqua | insane | up to 2.6.2 | — | No fix listed | CNA |
| — | insane (npm) | up to 2.6.2 | — | No fix listed | GHSA-w455-mfq9-hf74 |
- insane Vendorbevacqua Affected up to 2.6.2 Fixed in — No fix listed CNA
- insane (npm) Vendor— Affected up to 2.6.2 Fixed in — No fix listed GHSA-w455-mfq9-hf74
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 1 product
- Logging Subsystem for Red Hat OpenShift
Timeline
- 2026-10-02 Threatist record created from CVE-2020-26303
- 2026-10-03 Alias added: GHSA-w455-mfq9-hf74
References
Sources
- CVE-2020-26303 · CVE Program
- CVE-2020-26303 · NVD
- FIRST EPSS
- GHSA-w455-mfq9-hf74 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-26303 · Red Hat security data · CC BY 4.0
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