Lib/ipaddress.py in Python through 3.8.3 improperly computes hash values in the IPv4Interface and IPv6Interface classes, which might allow a

Summary

Lib/ipaddress.py in Python through 3.8.3 improperly computes hash values in the IPv4Interface and IPv6Interface classes, which might allow a remote attacker to cause a denial of service if an application is affected by the performance of a dictionary containing IPv4Interface or IPv6Interface objects, and this attacker can cause many dictionary entries to be created. This is fixed in: v3.5.10, v3.5.10rc1; v3.6.12; v3.7.9; v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1; v3.9.0, v3.9.0b4, v3.9.0b5, v3.9.0rc1, v3.9.0rc2.

Timeline

1. Jun 18, 2020, 12:00 AM UTCCVE published
2. Oct 8, 2026, 9:01 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 14, 2026, 9:29 AM UTCRecord last updated
4. Oct 22, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• libpythonBitnami

  From 3.0.0 · fixed in 3.5.10; From 3.6.0 · fixed in 3.6.12; From 3.7.0 · fixed in 3.7.9; From 3.8.0 · fixed in 3.8.4

• pythonBitnami

  From 3.0.0 · fixed in 3.5.10; From 3.6.0 · fixed in 3.6.12; From 3.7.0 · fixed in 3.7.9; From 3.8.0 · fixed in 3.8.4

• python-minBitnami

  From 3.0.0 · fixed in 3.5.10; From 3.6.0 · fixed in 3.6.12; From 3.7.0 · fixed in 3.7.9; From 3.8.0 · fixed in 3.8.4

References 24