CVE-2021-27291

Description

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
eric	25.10 questing	Vulnerable
	25.04 plucky	Vulnerable
	24.10 oracular	Ignored end of life, was needed
	24.04 LTS noble	Vulnerable
	23.10 mantic	Ignored end of life, was needed
	23.04 lunar	Ignored end of life, was needed
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Vulnerable
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Not in release
pygments	25.10 questing	Fixed 2.7.1+dfsg-2ubuntu1
	25.04 plucky	Fixed 2.7.1+dfsg-2ubuntu1
	24.10 oracular	Fixed 2.7.1+dfsg-2ubuntu1
	24.04 LTS noble	Fixed 2.7.1+dfsg-2ubuntu1
	23.10 mantic	Fixed 2.7.1+dfsg-2ubuntu1
	23.04 lunar	Fixed 2.7.1+dfsg-2ubuntu1
	22.10 kinetic	Fixed 2.7.1+dfsg-2ubuntu1
	22.04 LTS jammy	Fixed 2.7.1+dfsg-2ubuntu1
	21.10 impish	Fixed 2.7.1+dfsg-2ubuntu1
	21.04 hirsute	Fixed 2.7.1+dfsg-2ubuntu1
	20.10 groovy	Fixed 2.3.1+dfsg-4ubuntu0.2
	20.04 LTS focal	Fixed 2.3.1+dfsg-1ubuntu2.2
	18.04 LTS bionic	Fixed 2.2.0+dfsg-1ubuntu0.2
	16.04 LTS xenial	Fixed 2.1+dfsg-1ubuntu0.2
	14.04 LTS trusty	Fixed 1.6+dfsg-1ubuntu1.1+esm1

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Notes

avital

eric looks to contain a vendored copy of pygments

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
pygments	Upstream: 2e7e8c4

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2021-27291

Cvss 3 Severity Score