CVE-2021-20270
First published: Thu Dec 10 2020(Updated: )
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.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/automation-hub | <0:4.2.2-1.el7 | 0:4.2.2-1.el7 |
| redhat/python3-django | <0:2.2.18-1.el7 | 0:2.2.18-1.el7 |
| redhat/python-bleach | <0:3.3.0-1.el7 | 0:3.3.0-1.el7 |
| redhat/python-bleach-allowlist | <0:1.0.3-1.el7 | 0:1.0.3-1.el7 |
| redhat/python-galaxy-importer | <0:0.2.15-1.el7 | 0:0.2.15-1.el7 |
| redhat/python-galaxy-ng | <0:4.2.2-1.el7 | 0:4.2.2-1.el7 |
| redhat/python-pulp-ansible | <1:0.5.6-1.el7 | 1:0.5.6-1.el7 |
| redhat/automation-hub | <0:4.2.2-1.el8 | 0:4.2.2-1.el8 |
| redhat/python3-django | <0:2.2.18-1.el8 | 0:2.2.18-1.el8 |
| redhat/python-bleach | <0:3.3.0-1.el8 | 0:3.3.0-1.el8 |
| redhat/python-bleach-allowlist | <0:1.0.3-1.el8 | 0:1.0.3-1.el8 |
| redhat/python-galaxy-importer | <0:0.2.15-1.el8 | 0:0.2.15-1.el8 |
| redhat/python-galaxy-ng | <0:4.2.2-1.el8 | 0:4.2.2-1.el8 |
| redhat/python-pulp-ansible | <1:0.5.6-1.el8 | 1:0.5.6-1.el8 |
| redhat/resource-agents | <0:4.1.1-98.el8 | 0:4.1.1-98.el8 |
| redhat/python27-babel | <0:0.9.6-10.el7 | 0:0.9.6-10.el7 |
| redhat/python27-python | <0:2.7.18-3.el7 | 0:2.7.18-3.el7 |
| redhat/python27-python-jinja2 | <0:2.6-16.el7 | 0:2.6-16.el7 |
| redhat/python27-python-pygments | <0:1.5-5.el7 | 0:1.5-5.el7 |
| ubuntu/pygments | <2.7.1+dfsg-2 | 2.7.1+dfsg-2 |
| ubuntu/pygments | <1.6+dfsg-1ubuntu1.1+ | 1.6+dfsg-1ubuntu1.1+ |
| ubuntu/pygments | <2.2.0+dfsg-1ubuntu0.1 | 2.2.0+dfsg-1ubuntu0.1 |
| ubuntu/pygments | <2.3.1+dfsg-1ubuntu2.1 | 2.3.1+dfsg-1ubuntu2.1 |
| ubuntu/pygments | <2.3.1+dfsg-4ubuntu0.1 | 2.3.1+dfsg-4ubuntu0.1 |
| ubuntu/pygments | <2.7.1+dfsg-2 | 2.7.1+dfsg-2 |
| ubuntu/pygments | <2.7.4 | 2.7.4 |
| ubuntu/pygments | <2.1+dfsg-1ubuntu0.1 | 2.1+dfsg-1ubuntu0.1 |
| ubuntu/pygments | <2.7.1+dfsg-2 | 2.7.1+dfsg-2 |
| ubuntu/pygments | <2.7.1+dfsg-2 | 2.7.1+dfsg-2 |
| ubuntu/pygments | <2.7.1+dfsg-2 | 2.7.1+dfsg-2 |
| Pygments Pygments | >=1.5<=2.7.3 | |
| Redhat Openshift Container Platform | =3.11 | |
| Redhat Openshift Container Platform | =4.0 | |
| Redhat Openstack Platform | =10.0 | |
| Redhat Software Collections | ||
| Redhat Enterprise Linux | =7.0 | |
| Redhat Enterprise Linux | =8.0 | |
| Fedoraproject Fedora | =33 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| pip/Pygments | >=1.5<2.7.4 | 2.7.4 |
| debian/mediawiki | 1:1.31.16-1+deb10u2 1:1.31.16-1+deb10u6 1:1.35.11-1~deb11u1 1:1.35.13-1~deb11u1 1:1.39.4-1~deb12u1 1:1.39.5-1~deb12u1 1:1.39.5-1 | |
| debian/pygments | 2.3.1+dfsg-1+deb10u2 2.7.1+dfsg-2.1 2.14.0+dfsg-1 2.15.1+dfsg-1 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2021-20270
- https://bugzilla.redhat.com/show_bug.cgi?id=1922136
- https://www.debian.org/security/2021/dsa-4889
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://github.com/pygments/pygments/commit/f91804ff4772e3ab41f46e28d370f57898700333
- https://github.com/advisories/GHSA-9w8r-397f-prfh (Advisory)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20270
- https://ubuntu.com/security/notices/USN-4885-1
- https://ubuntu.com/security/notices/USN-4897-2
- https://launchpad.net/bugs/cve/CVE-2021-20270
- https://security-tracker.debian.org/tracker/CVE-2021-20270
- https://ubuntu.com/security/CVE-2021-20270
- https://www.cve.org/CVERecord?id=CVE-2021-20270 https://nvd.nist.gov/vuln/detail/CVE-2021-20270
- https://access.redhat.com/errata/RHSA-2021:0781
- https://access.redhat.com/errata/RHSA-2021:4150
- https://access.redhat.com/errata/RHSA-2021:4151
- https://access.redhat.com/errata/RHSA-2021:4139
- https://access.redhat.com/errata/RHSA-2021:3252
- https://access.redhat.com/security/cve/cve-2021-20270
- https://github.com/pygments/pygments/issues/1625
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1922137
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1944269
- https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-140.yaml
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-20270.
What is the severity level of CVE-2021-20270?
The severity level of CVE-2021-20270 is high, with a CVSS score of 7.5.
Which software versions are affected by CVE-2021-20270?
Pygments versions 1.5 to 2.7.3 are affected by CVE-2021-20270.
How can I fix the vulnerability in Pygments?
To fix the vulnerability, update Pygments to version 2.7.4.
Where can I find more information about CVE-2021-20270?
More information about CVE-2021-20270 can be found at the following references: [Reference 1](https://bugzilla.redhat.com/show_bug.cgi?id=1922136), [Reference 2](https://www.debian.org/security/2021/dsa-4889), [Reference 3](https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html).
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