CVE-2023-43646

Status: ModifiedHigh (7.5)—PoC

Severity7.5High · CVSS 3.1

Exploitation probability1.38 %higher than 72% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitAvailableProof of concept on GitHub (unverified)

get-func-name is a module to retrieve a function's name securely and consistently both in NodeJS and the browser. Versions prior to 2.0.1 are subject to a regular expression denial of service (redos) vulnerability which may lead to a denial of service when parsing malicious input. This vulnerability can be exploited when there is an imbalance in parentheses, which results in excessive backtracking and subsequently increases the CPU load and processing time significantly. This vulnerability can be triggered using the following input: '\t'.repeat(54773) + '\t/function/i'. This issue has been addressed in commit `f934b228b` which has been included in releases from 2.0.1. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS

Base score: 7.5
Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 1.38 %
Percentile among all scored CVEs: 72
Score date: 10/21/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Chaijs — Get-func-name

CWEs

CWE-400, CWE-1333

References

Show 4 references

Raw JSON (NVD)

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      "value": "get-func-name is a module to retrieve a function's name securely and consistently both in NodeJS and the browser. Versions prior to 2.0.1 are subject to a regular expression denial of service (redos) vulnerability which may lead to a denial of service when parsing malicious input. This vulnerability can be exploited when there is an imbalance in parentheses, which results in excessive backtracking and subsequently increases the CPU load and processing time significantly. This vulnerability can be triggered using the following input: '\\t'.repeat(54773) + '\\t/function/i'. This issue has been addressed in commit `f934b228b` which has been included in releases from 2.0.1. Users are advised to upgrade. There are no known workarounds for this vulnerability."
    },
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      "lang": "es",
      "value": "get-func-name es un módulo para recuperar el nombre de una función de forma segura y consistente tanto en NodeJS como en el navegador. Las versiones anteriores a la 2.0.1 están sujetas a una vulnerabilidad de denegación de servicio de expresión regular (redos) que puede provocar una denegación de servicio al analizar entradas maliciosas. Esta vulnerabilidad se puede aprovechar cuando hay un desequilibrio entre paréntesis, lo que da como resultado un retroceso excesivo y, posteriormente, aumenta significativamente la carga de la CPU y el tiempo de procesamiento. Esta vulnerabilidad se puede activar utilizando la siguiente entrada: '\\t'.repeat(54773) + '\\t/function/i'. Este problema se solucionó en el commit `f934b228b` que se incluyó en las versiones 2.0.1. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T06:26:08.773",
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