Sqlalchemy mako before 1.2.2 is vulnerable to Regular expression Denial of Service when using the Lexer class to parse. This also affects babelplugin and linguaplugin.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mako | Sqlalchemy | * | 1.2.2 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | python-mako-0:1.0.6-14.el8 | * |
| Red Hat Enterprise Linux 9 | RedHat | python-mako-0:1.1.4-6.el9 | * |
| Mako | Ubuntu | bionic | * |
| Mako | Ubuntu | devel | * |
| Mako | Ubuntu | esm-infra/xenial | * |
| Mako | Ubuntu | focal | * |
| Mako | Ubuntu | jammy | * |
| Mako | Ubuntu | kinetic | * |
| Mako | Ubuntu | lunar | * |
| Mako | Ubuntu | trusty | * |
| Mako | Ubuntu | upstream | * |
| Mako | Ubuntu | xenial | * |
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.