CVE-2023-43646Public exploitNetwork attack vector

Service interruption via function-name regex backtracking

Published Sep 26, 2023 · Updated Sep 24, 2024

ReDoS in get-func-name before 2.0.1 allows attackers to interrupt a consuming service via crafted function source text. The getFuncName fallback applies functionNameMatch to a function's string representation; overlapping whitespace branches backtrack excessively before an imbalanced parenthesis. Reachability requires attacker-influenced function source to enter the legacy name-detection fallback, where processing the payload consumes CPU and stalls the host application.

CVSS severity8.6
High
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

ReDoS in get-func-name before 2.0.1 allows attackers to interrupt a consuming service via crafted function source text. The getFuncName fallback applies functionNameMatch to a function's string representation; overlapping whitespace branches backtrack excessively before an imbalanced parenthesis. Reachability requires attacker-influenced function source to enter the legacy name-detection fallback, where processing the payload consumes CPU and stalls the host application.

The record

CVE
CVE-2023-43646
Published
Sep 26, 2023
Updated
Sep 24, 2024
Vendor
Chai
Product
get-func-name
Classifications
CWE-400, CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chai · get-func-nameversion=< 2.0.1

Published CVSS scores

8.6GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo