Description
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.
References (5)
Core 5
Core References
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1922136
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4889
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
Not Applicable, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2021.html
Scores
CVSS v3
7.5
EPSS
0.0022
EPSS Percentile
44.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-835
Status
published
Products (11)
debian/debian_linux
9.0
debian/debian_linux
10.0
fedoraproject/fedora
33
pygments/pygments
1.5 - 2.7.3
pypi/Pygments
1.5 - 2.7.4PyPI
redhat/enterprise_linux
7.0
redhat/enterprise_linux
8.0
redhat/openshift_container_platform
3.11
redhat/openshift_container_platform
4.0
redhat/openstack_platform
10.0
... and 1 more
Published
Mar 23, 2021
Tracked Since
Feb 18, 2026