Regular expression denial of service in Pydanic < 2.4.0, < 1.10.13 allows remote attackers to cause denial of service via a crafted email string.
Weakness
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pydantic | Pydantic | * | 1.10.13 (excluding) |
| Pydantic | Pydantic | 2.0 (including) | 2.4.0 (excluding) |
| Red Hat Ansible Automation Platform 2.4 for RHEL 8 | RedHat | automation-controller-0:4.5.7-1.el8ap | * |
| Red Hat Ansible Automation Platform 2.4 for RHEL 8 | RedHat | python3x-pydantic-0:1.10.15-1.el8ap | * |
| Red Hat Ansible Automation Platform 2.4 for RHEL 9 | RedHat | automation-controller-0:4.5.7-1.el9ap | * |
| Red Hat Ansible Automation Platform 2.4 for RHEL 9 | RedHat | python-pydantic-0:1.10.15-1.el9ap | * |
| Pydantic | Ubuntu | esm-apps/focal | * |
| Pydantic | Ubuntu | esm-apps/jammy | * |
| Pydantic | Ubuntu | focal | * |
| Pydantic | Ubuntu | jammy | * |
| Pydantic | Ubuntu | mantic | * |
| Pydantic | Ubuntu | upstream | * |
Extended Description
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.
Potential Mitigations
Related Attack Patterns
References
- https://github.com/pydantic/pydantic/pull/7360
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6JBZLMSH4GAZOVBMT2JUO2LXHY7M2ALI/
- https://github.com/pydantic/pydantic/pull/7360
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6JBZLMSH4GAZOVBMT2JUO2LXHY7M2ALI/