CVE Vulnerabilities

CVE-2021-20270

Loop with Unreachable Exit Condition ('Infinite Loop')

Published: Mar 23, 2021 | Modified: Dec 10, 2021
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
7.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu

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.

Weakness

The program contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

Affected Software

Name Vendor Start Version End Version
Pygments Pygments 1.5 2.7.3
Red Hat Automation Hub 4.2 for RHEL 7 RedHat automation-hub-0:4.2.2-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 7 RedHat python3-django-0:2.2.18-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 7 RedHat python-bleach-0:3.3.0-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 7 RedHat python-bleach-allowlist-0:1.0.3-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 7 RedHat python-galaxy-importer-0:0.2.15-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 7 RedHat python-galaxy-ng-0:4.2.2-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 7 RedHat python-pulp-ansible-1:0.5.6-1.el7pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat automation-hub-0:4.2.2-1.el8pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat python3-django-0:2.2.18-1.el8pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat python-bleach-0:3.3.0-1.el8pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat python-bleach-allowlist-0:1.0.3-1.el8pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat python-galaxy-importer-0:0.2.15-1.el8pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat python-galaxy-ng-0:4.2.2-1.el8pc *
Red Hat Automation Hub 4.2 for RHEL 8 RedHat python-pulp-ansible-1:0.5.6-1.el8pc *
Red Hat Enterprise Linux 8 RedHat python36:3.6-8050020210811103506.982725ab *
Red Hat Enterprise Linux 8 RedHat python27:2.7-8050020210811095446.3e7ace8b *
Red Hat Enterprise Linux 8 RedHat resource-agents-0:4.1.1-98.el8 *
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat python27-babel-0:0.9.6-10.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat python27-python-0:2.7.18-3.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat python27-python-jinja2-0:2.6-16.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7 RedHat python27-python-pygments-0:1.5-5.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS RedHat python27-babel-0:0.9.6-10.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS RedHat python27-python-0:2.7.18-3.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS RedHat python27-python-jinja2-0:2.6-16.el7 *
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS RedHat python27-python-pygments-0:1.5-5.el7 *
Pygments Ubuntu bionic *
Pygments Ubuntu devel *
Pygments Ubuntu esm-infra/xenial *
Pygments Ubuntu focal *
Pygments Ubuntu groovy *
Pygments Ubuntu hirsute *
Pygments Ubuntu impish *
Pygments Ubuntu jammy *
Pygments Ubuntu precise/esm *
Pygments Ubuntu trusty *
Pygments Ubuntu upstream *
Pygments Ubuntu xenial *

References