Vulnerability identifier: #VU82226

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-40896

CWE-ID: CWE-1333

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 (DoS) attack.

The vulnerability exists due to insufficient input validation when processing untrusted input with a regular expressions in pygments/lexers/smithy.py. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

pygments: 2.0 - 2.15.0

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External links
http://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages-part-2/
http://github.com/pygments/pygments/blob/master/pygments/lexers/smithy.py#L61

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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.