Resource exhaustion in Palletsprojects Jinja
CVE-2020-28493
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDoS vulnerability is mainly due to the `_punctuation_re regex` operator and its use of multiple wildcards. The last wildcard is the most exploitable as it searches for trailing punctuation. 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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.035 (89.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000
Affected products
- Palletsprojects Jinja
- Fedoraproject Fedora — versions 33
- Jinja2 — versions 0.0.0, unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994 (Exploit, Third Party Advisory)
- github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinj… (Broken Link)
- github.com/pallets/jinja/pull/1343 (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202107-19 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-28493?
- CVE-2020-28493 is a medium-severity vulnerability in Palletsprojects Jinja, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-02-01.
- How severe is CVE-2020-28493?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-28493 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.