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Vulnerability record · CVE-2026-23842 · published 19 January 2026

CVE-2026-23842: Chatterbot uncontrolled resource consumption vulnerability

Chatterbot · Chatterbot

ChatterBot is a machine learning, conversational dialog engine for creating chat bots. ChatterBot versions up to 1.2.10 are vulnerable to a denial-of-service condition caused by improper database session and connection pool management. Concurrent invocations of the get_response() method can exhaust the underlying SQLAlchemy connection pool, resulting in persistent service unavailability and requiring a manual restart to recover. Version 1.2.11 fixes the issue.

7.5 CVSS 3.1 High EPSS 0.55% · top 56.3% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

ChatterBot is a machine learning, conversational dialog engine for creating chat bots. ChatterBot versions up to 1.2.10 are vulnerable to a denial-of-service condition caused by improper database session and connection pool management. Concurrent invocations of the get_response() method can exhaust the underlying SQLAlchemy connection pool, resulting in persistent service unavailability and requiring a manual restart to recover. Version 1.2.11 fixes the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gunthercox/ChatterBot/commit/de89fe648139f8eeacc998ad4524fab291a378cf Patch
https://github.com/gunthercox/ChatterBot/pull/2432 Issue Tracking
https://github.com/gunthercox/ChatterBot/releases/tag/1.2.11 ProductRelease Notes
https://github.com/gunthercox/ChatterBot/security/advisories/GHSA-v4w8-49pv-mf72 ExploitVendor Advisory
https://github.com/user-attachments/assets/4ee845c4-b847-4854-84ec-4b2fb2f7090f Exploit

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Source: NIST National Vulnerability Database (record CVE-2026-23842), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.