#VU51776 Resource management error in pygments - CVE-2021-27291

Vulnerability identifier: #VU51776

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-27291

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pygments
Other software / Other software solutions

Vendor: pygments

Description

The vulnerability allows a remote attacker to perform a denial of service (ReDoS) attack.

The vulnerability exists due to improper management of internal resources within the application. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

pygments: 1.1 - 2.7.3

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External 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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.