DEBIAN-CVE-2021-27291

Advisory lineage Upstream: 1 Downstream: 4
Upstream
CVE-2021-27291
Published: 17 Mar 2021, 13:15
Last modified:28 Apr 2026, 20:22

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Mar 2021, 13:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:22
Last Modified
Vulnerability information updated

Description

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • debian•mediawiki

    < 1:1.35.2-1 | < 1:1.35.2-1 | < 1:1.35.2-1 | < 1:1.35.2-1

  • debian•pygments

    < 2.7.1+dfsg-2.1 | < 2.7.1+dfsg-2.1 | < 2.7.1+dfsg-2.1 | < 2.7.1+dfsg-2.1

References (1)