dbartholomae lambda-middleware frameguard JSON Mime-Type JsonDeserializer.ts redos
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
A vulnerability, which was classified as problematic, has been found in dbartholomae lambda-middleware frameguard up to 1.0.4. Affected by this issue is some unknown functionality of the file packages/json-deserializer/src/JsonDeserializer.ts of the component JSON Mime-Type Handler. The manipulation leads to inefficient regular expression complexity. Upgrading to version 1.1.0 is able to address this issue. The patch is identified as f689404d830cbc1edd6a1018d3334ff5f44dc6a6. It is recommended to upgrade the affected component. VDB-253406 is the identifier assigned to this vulnerability.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- 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 |
|---|---|---|---|---|---|
| dbartholomae | lambda-middleware frameguard | 1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.0.4 | — | No fix listed | CNA |
| — | @lambda-middleware/json-deserializer (npm) | before 1.1.0 | 1.1.0 | Patch available | GHSA-m3f4-957x-m785 |
- lambda-middleware frameguard Vendordbartholomae Affected 1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.0.4 Fixed in — No fix listed CNA
- @lambda-middleware/json-deserializer (npm) Vendor— Affected before 1.1.0 Fixed in 1.1.0 Patch available GHSA-m3f4-957x-m785
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dbartholomae:lambda-middleware:*:*:*:*:*:*:*:* | up to 1.0.4 | Vulnerable | dbartholomae |
- cpe:2.3:a:dbartholomae:lambda-middleware:*:*:*:*:*:*:*:* Versions up to 1.0.4 Vulnerable ·dbartholomae
Remediation
- Fix · GHSA-m3f4-957x-m785 @lambda-middleware/json-deserializer (npm) Fixed in 1.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4437
- 2026-10-03 Alias added: GHSA-m3f4-957x-m785
References
Patch 3
Sources
- CVE-2021-4437 · CVE Program
- CVE-2021-4437 · NVD
- FIRST EPSS
- GHSA-m3f4-957x-m785 · GitHub Advisory Database · CC BY 4.0
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