medium5.3
CVE-2020-28493
Regular Expression Denial of Service (ReDoS) in Jinja2
Impact
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9._-]+.[a-zA-Z0-9._-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | jinja2 | < 2.11.3 | 2.11.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Palletsprojects | Jinja | before 2.11.3 |
| Fedoraproject | Fedora | Version 33 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20
- https://github.com/pallets/jinja/pull/1343
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4/
- https://security.gentoo.org/glsa/202107-19
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
- https://github.com/advisories/GHSA-g3rq-g295-4j3m
- https://nvd.nist.gov/vuln/detail/CVE-2020-28493
- https://github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d
- https://github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4