cve.bz

CVE-2021-27291

7.5 highEPSS 3.9%

High (7.5). EPSS 3.9% chance of exploitation in the next 30 days. Fixed in pygments 2.7.4.

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.

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
3.9% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
CWE
CWE-1333
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-pq64-v7f5-gqh8PyPIpygments>=1.1 <2.7.42.7.4
PYSEC-2021-141PyPIpygments>=1.1 <2.7.42.7.4

References

Check your stackJSON