CVE-2021-27291
First published: Mon Jan 11 2021(Updated: )
A denial of service attack was discovered against pygments. Some of the regular expressions used to tokenise source code for highlighting have exponential complexity. A specially crafted input file could cause pygments to take effectively infinite time to parse, consuming CPU resources and denying access to the service.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/Pygments | >=1.1<2.7.4 | 2.7.4 |
| Pygments Pygments | >=1.1<2.7.4 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| debian/pygments | <=2.3.1+dfsg-1+deb10u1<=2.7.1+dfsg-2<=2.3.1+dfsg-1 | 2.3.1+dfsg-1+deb10u2 2.7.1+dfsg-2.1 |
| redhat/python-pygments | <2.7.4 | 2.7.4 |
| 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 |
| 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 | |
| ubuntu/pygments | <2.7.1+dfsg-2ubuntu1 | 2.7.1+dfsg-2ubuntu1 |
| ubuntu/pygments | <2.2.0+dfsg-1ubuntu0.2 | 2.2.0+dfsg-1ubuntu0.2 |
| ubuntu/pygments | <2.3.1+dfsg-1ubuntu2.2 | 2.3.1+dfsg-1ubuntu2.2 |
| ubuntu/pygments | <2.3.1+dfsg-4ubuntu0.2 | 2.3.1+dfsg-4ubuntu0.2 |
| ubuntu/pygments | <2.7.1+dfsg-2ubuntu1 | 2.7.1+dfsg-2ubuntu1 |
| ubuntu/pygments | <2.7.4 | 2.7.4 |
| ubuntu/pygments | <2.1+dfsg-1ubuntu0.2 | 2.1+dfsg-1ubuntu0.2 |
| ubuntu/pygments | <1.6+dfsg-1ubuntu1.1+ | 1.6+dfsg-1ubuntu1.1+ |
| ubuntu/pygments | <2.7.1+dfsg-2ubuntu1 | 2.7.1+dfsg-2ubuntu1 |
| ubuntu/pygments | <2.7.1+dfsg-2ubuntu1 | 2.7.1+dfsg-2ubuntu1 |
| ubuntu/pygments | <2.7.1+dfsg-2ubuntu1 | 2.7.1+dfsg-2ubuntu1 |
| ubuntu/pygments | <2.7.1+dfsg-2ubuntu1 | 2.7.1+dfsg-2ubuntu1 |
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Reference Links
- https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce
- https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14
- https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
- https://www.debian.org/security/2021/dsa-4878
- https://www.debian.org/security/2021/dsa-4889
- https://nvd.nist.gov/vuln/detail/CVE-2021-27291
- https://github.com/advisories/GHSA-pq64-v7f5-gqh8 (Advisory)
- https://launchpad.net/bugs/cve/CVE-2021-27291
- https://security-tracker.debian.org/tracker/CVE-2021-27291
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27291
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=985574
- https://www.cve.org/CVERecord?id=CVE-2021-27291 https://nvd.nist.gov/vuln/detail/CVE-2021-27291
- https://bugzilla.redhat.com/show_bug.cgi?id=1940603
- 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-2021-27291
- https://ubuntu.com/security/notices/USN-4897-1
- https://ubuntu.com/security/notices/USN-4897-2
- https://ubuntu.com/security/CVE-2021-27291
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1940604
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1940605
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
- https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-141.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-27291.
What is the severity of CVE-2021-27291?
CVE-2021-27291 has a severity value of 7, which is considered high.
What is the description of CVE-2021-27291?
CVE-2021-27291 is a denial of service attack against pygments where specially crafted input files can cause the software to take infinite time to parse, consuming CPU resources.
How do I fix CVE-2021-27291?
To fix CVE-2021-27291, update your pygments package to version 2.7.4.
Where can I find more information about CVE-2021-27291?
You can find more information about CVE-2021-27291 in the references provided: https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce, https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14, https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html
- collector/nvd-api
- collector/launchpad-cve
- collector/debian-bugs
- alias/CVE-2021-27291
- collector/redhat-cve
- collector/security-tracker-debian
- collector/nvd-index
- collector/usn-cve
- agent/type
- agent/softwarecombine
- agent/first-publish-date
- agent/remedy
- agent/severity
- agent/weakness
- agent/author
- collector/redhat-bugzilla
- source/Red Hat
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/event
- agent/description
- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-pq64-v7f5-gqh8
- agent/last-modified-date
- agent/references
- collector/nvd-cve
- source/NVD
- collector/github-advisory
- agent/tags
- agent/trending
- vendor/pygments
- canonical/pygments pygments
- version/pygments pygments/1.1
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/32
- version/fedoraproject fedora/33
- package-manager/debian
- package-manager/redhat
- package-manager/ubuntu
- package-manager/pip