CVE-2021-4437 json
dbartholomae lambda-middleware frameguard JSON Mime-Type JsonDeserializer.ts redos
published 2024-02-12 2 y ago modified 2026-06-17 4 mo ago also GHSA-m3f4-957x-m785 , EUVD-2024-0667
- cvss
- 3.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
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.
Patch / fix
- npm @lambda-middleware/json-deserializer 1.1.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.5 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| CNA | 3.0 | 3.5 | CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| CNA | 2.0 | 2.7 | AV:A/AC:L/Au:S/C:N/I:N/A:P |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 3.5 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @lambda-middleware/json-deserializer | <1.1.0 |
1.1.0 |
Affected products
- dbartholomae lambda-middleware frameguard
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
References
-
github.com
/dbartholomae/lambda-middleware/pull/57
issue-tracking, web, patch
-
github.com
/dbartholomae/lambda-middleware/commit/f689404d830cbc1edd6a1018d3334ff5f44dc6a6
patch, web
-
github.com
/dbartholomae/lambda-middleware/releases/tag/%40lambda-middleware%2Fframeguard_v1.1.0
patch, web, release-notes
-
vuldb.com
/?id.253406
vdb-entry, web, third-party-advisory
-
vuldb.com
/?ctiid.253406
signature, permissions-required, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-4437
advisory
-
github.com
/dbartholomae/lambda-middleware
package
-
github.com
/dbartholomae/lambda-middleware/releases/tag/@lambda-middleware/frameguard_v1.1.0
web
Sources
- CVE List CVE-2021-4437
- GitHub Advisory GHSA-m3f4-957x-m785
- NVD CVE-2021-4437
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.