CVE-2022-34749

Aliases:GHSA-fw3v-x4f2-v673PYSEC-2022-237
Advisory lineage Upstream: 0 Downstream: 5
Modified
Published: 25 Jul 2022, 00:00
Last modified:03 Aug 2024, 09:22

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
0.52% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Jul 2022, 00:00
Published
Vulnerability first disclosed
03 Aug 2024, 09:22
Last Modified
Vulnerability information updated

Description

In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.

CVSS Metrics

  • v4.0•HIGH•Score: 8.8CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v3.1•HIGH•Score: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

EPSS Trends

Current EPSS score: 0.52%• Percentile: 67%

Techniques & Countermeasures

  • CWE-1333•Inefficient Regular Expression Complexity

    The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

Affected Systems

  • fedoraproject•fedora

    37

  • mistune_project•mistune

    ≤ 2.0.2

  • PyPI•mistune

    < a6d43215132fe4f3d93f8d7e90ba83b16a0838b2 | ≥ 2.0.0a1, < 2.0.3

References (10)