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Fencer Vulns
high 7.5

CVE-2026-23842 json

ChatterBot has Denial of Service via Database Connection Pool Exhaustion

published 2026-01-19 9 mo ago modified 2026-07-07 4 mo ago also GHSA-v4w8-49pv-mf72 , PYSEC-2026-1244 , EUVD-2026-3299

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi chatterbot 1.2.11
  • chatterbot chatterbot 1.2.11

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/gunthercox/ChatterBot/security/advisories/GHSA-v4w8-49pv-mf72 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/user-attachments/assets/4ee845c4-b847-4854-84ec-4b2fb2f7090f referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi chatterbot
<1.2.11
1.2.11

Affected products

  • gunthercox ChatterBot

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

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.