CVE-2021-20270

moderate-risk
Published 2021-03-23

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.

Do I need to act?

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0.22% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (10)

Pygments

Affected Vendors

Debian Redhat Fedoraproject Pygments

References (10)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1922136
Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
Third Party Advisory https://www.debian.org/security/2021/dsa-4889
Not Applicable https://www.oracle.com/security-alerts/cpuoct2021.html
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1922136
Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
Third Party Advisory https://www.debian.org/security/2021/dsa-4889
Not Applicable https://www.oracle.com/security-alerts/cpuoct2021.html
43
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 1/34 · Minimal
Exposure 16/34 · Moderate