high7.5
CVE-2021-26813
markdown2 Regular Expression Denial of Service
Impact
markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | markdown2 | >= 1.0.1.18, < 2.4.0 | 2.4.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Markdown2 Project | Markdown2 | from 1.0.1.18 before 2.4.0 |
| Fedoraproject | Fedora | Versions 32, 33, 34 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/trentm/python-markdown2/pull/387
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/
- https://github.com/advisories/GHSA-jr9p-r423-9m2r
- https://nvd.nist.gov/vuln/detail/CVE-2021-26813
- https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374
- https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY