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CVE-2021-26813

Good to know:

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Date: March 3, 2021

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.

Language: Python

Severity Score

Related Resources (13)

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/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY
https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374
https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml
https://github.com/advisories/GHSA-jr9p-r423-9m2r
https://nvd.nist.gov/vuln/detail/CVE-2021-26813
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/
https://github.com/trentm/python-markdown2
https://lists.fedoraproject.org/archives/list/package-announce@lists.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/J752422YELXLMLZJPVJVKD2KKHHQRVEH/
https://www.mend.io/vulnerability-database/CVE-2021-26813

Severity Score

Weakness Type (CWE)

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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