high7.5
CVE-2021-20270
Infinite Loop in Pygments
Impact
An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | Pygments | >= 1.5, < 2.7.4 | 2.7.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pygments | Pygments | from 1.5 through 2.7.3 |
| Redhat | Openshift Container Platform | Versions 3.11, 4.0 |
| Redhat | Openstack Platform | Version 10.0 |
| Redhat | Software Collections | All versions |
| Redhat | Enterprise Linux | Versions 7.0, 8.0 |
| Fedoraproject | Fedora | Version 33 |
| Debian | Debian Linux | Versions 9.0, 10.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1922136
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
- https://www.debian.org/security/2021/dsa-4889
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://github.com/advisories/GHSA-9w8r-397f-prfh
- https://nvd.nist.gov/vuln/detail/CVE-2021-20270
- https://github.com/pygments/pygments/commit/f91804ff4772e3ab41f46e28d370f57898700333
- https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-140.yaml