Security readout for executives and security teams
Plain-English summary
CVE-2020-26309 is a denial-of-service risk in ftonato/nope-validator. Specially crafted input can make vulnerable regular expressions consume excessive CPU, potentially slowing or freezing services that validate untrusted data. The source bundle says patch availability was unknown at publication.
Executive priority
Prioritize systems where this library validates internet-facing input. The issue is availability-focused, but unauthenticated network reachability and unknown patch status make it operationally important.
Technical view
Versions 0.11.3 and prior are reported vulnerable to Regular Expression Denial of Service, mapped to CWE-1333. The CVSS 4.0 score is 8.7 high, driven by network reachability, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely in JavaScript applications that include ftonato/nope-validator and pass attacker-controlled input into validation paths, especially public forms or API request handling.
Exploitation context
No provided source reports active exploitation, and the CVE is not marked KEV. The practical risk depends on whether vulnerable validation runs on untrusted input in reachable services.
Researcher notes
The bundle contains a product-description inconsistency: it names ftonato/nope-validator but describes Validate.js. Treat package identity carefully during triage and rely on the linked GHSL advisory and vendor issue for confirmation.
Mitigation direction
- Inventory applications and lockfiles for ftonato/nope-validator versions 0.11.3 or prior.
- Check the vendor issue and advisory for any fixed release or official workaround.
- Upgrade or replace the dependency if a maintained fixed version is available.
- Limit input size before validation on public request paths.
- Add request timeouts and rate limits around exposed validation endpoints.
Validation and detection
- Confirm whether ftonato/nope-validator appears in production dependency trees.
- Identify public routes or APIs that pass user input to this validator.
- Review vendor references for patch status before declaring remediation complete.
- Use safe performance tests to confirm validation rejects large inputs promptly.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1333: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-26309 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Green
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Green——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Green
Source materials
- CVE List V5 sourceCVE List V5
- https://securitylab.github.com/advisories/GHSL-2020-303-redos-nope-validator/CVE reference
- https://github.com/ftonato/nope-validator/issues/352CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Inefficient Regular Expression Complexity
Inefficient Regular Expression Complexity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.