High severityOSV Advisory· Published Jan 19, 2026· Updated Jan 20, 2026
ChatterBot has Denial of Service via Database Connection Pool Exhaustion
CVE-2026-23842
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
chatterbotPyPI | < 1.2.11 | 1.2.11 |
Affected products
2- Range: 0.0.0, 0.0.1, 0.0.2, …
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-v4w8-49pv-mf72ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-23842ghsaADVISORY
- github.com/gunthercox/ChatterBot/commit/de89fe648139f8eeacc998ad4524fab291a378cfghsax_refsource_MISCWEB
- github.com/gunthercox/ChatterBot/pull/2432ghsax_refsource_MISCWEB
- github.com/gunthercox/ChatterBot/releases/tag/1.2.11ghsax_refsource_MISCWEB
- github.com/gunthercox/ChatterBot/security/advisories/GHSA-v4w8-49pv-mf72ghsax_refsource_CONFIRMWEB
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