CVE-2021-27291
CVSS v3
7.5
HIGH
EPSS Score
2.4 %
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-03-17
Frequently asked questions
What is CVE-2021-27291?
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.
Is CVE-2021-27291 actively exploited?
Active exploitation of CVE-2021-27291 has not been confirmed. The EPSS score is 2.4%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-27291?
CVE-2021-27291 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-27291 affecting your environment?
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