CVE-2021-26813
First published: Wed Mar 03 2021(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Markdown2 Project Markdown2 | >=1.0.1.18<2.4.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| pip/markdown2 | >=1.0.1.18<2.4.0 | 2.4.0 |
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Reference Links
- https://github.com/trentm/python-markdown2/pull/387
- 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/
- https://nvd.nist.gov/vuln/detail/CVE-2021-26813
- https://github.com/advisories/GHSA-jr9p-r423-9m2r (Advisory)
- 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/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/
- 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
Frequently Asked Questions
What is CVE-2021-26813?
CVE-2021-26813 is a vulnerability in markdown2 version 1.0.1.18 that allows for a regular expression denial of service attack.
How does CVE-2021-26813 affect markdown2?
CVE-2021-26813 affects markdown2 version 1.0.1.18 by allowing an attacker to provide a malicious string that can cause processing delays or difficulties.
What is the severity of CVE-2021-26813?
CVE-2021-26813 has a severity rating of 7.5 (high).
Which software versions are affected by CVE-2021-26813?
Markdown2 version 1.0.1.18, as well as Fedora versions 32, 33, and 34, are affected by CVE-2021-26813.
How do I fix CVE-2021-26813?
To fix CVE-2021-26813, update markdown2 to version 2.4.0 or later.
- collector/nvd-api
- collector/github-advisory
- alias/GHSA-jr9p-r423-9m2r
- alias/CVE-2021-26813
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/weakness
- agent/severity
- agent/author
- agent/description
- agent/first-publish-date
- agent/event
- collector/github-advisory-latest
- source/GitHub
- agent/software-canonical-lookup
- agent/last-modified-date
- agent/references
- agent/tags
- collector/nvd-cve
- source/NVD
- vendor/markdown2 project
- canonical/markdown2 project markdown2
- version/markdown2 project markdown2/1.0.1.18
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/32
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34
- package-manager/pip