CVE-2021-29510 Use of "infinity" as an input to datetime and date fields causes infinite loop in pydantic

2021-05-1318:55:11

CWE-835

GitHub_M

www.cve.org

cve-2021-29510

pydantic

datetime

infinite loop

cpu usage

patch

pypi

conda-forge

changelog

validator

upgrade

back-port

issue

fix

security advisory

CVSS3

3.3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS

0.002

Percentile

54.8%

JSON

Pydantic is a data validation and settings management using Python type hinting. In affected versions passing either 'infinity', 'inf' or float('inf') (or their negatives) to datetime or date fields causes validation to run forever with 100% CPU usage (on one CPU). Pydantic has been patched with fixes available in the following versions: v1.8.2, v1.7.4, v1.6.2. All these versions are available on pypi(https://pypi.org/project/pydantic/#history), and will be available on conda-forge(https://anaconda.org/conda-forge/pydantic) soon. See the changelog(https://pydantic-docs.helpmanual.io/) for details. If you absolutely can’t upgrade, you can work around this risk using a validator(https://pydantic-docs.helpmanual.io/usage/validators/) to catch these values. This is not an ideal solution (in particular you’ll need a slightly different function for datetimes), instead of a hack like this you should upgrade pydantic. If you are not using v1.8.x, v1.7.x or v1.6.x and are unable to upgrade to a fixed version of pydantic, please create an issue at https://github.com/samuelcolvin/pydantic/issues requesting a back-port, and we will endeavour to release a patch for earlier versions of pydantic.

CNA Affected

[
  {
    "product": "pydantic",
    "vendor": "samuelcolvin",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.8.0, < 1.8.2"
      },
      {
        "status": "affected",
        "version": ">= 1.7.0, < 1.7.4"
      },
      {
        "status": "affected",
        "version": "< 1.6.2"
      }
    ]
  }
]