CVE-2021-27291

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.

Database specific

{
    "unresolved_ranges": [
        {
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "9.0"
                        },
                        {
                            "last_affected": "9.0"
                        },
                        {
                            "introduced": "10.0"
                        },
                        {
                            "last_affected": "10.0"
                        }
                    ],
                    "source": "CPE_STRING"
                }
            ],
            "vendor_product": "debian:debian_linux"
        },
        {
            "cpes": [
                "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
                "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "32"
                        },
                        {
                            "last_affected": "32"
                        },
                        {
                            "introduced": "33"
                        },
                        {
                            "last_affected": "33"
                        }
                    ],
                    "source": "CPE_STRING"
                }
            ],
            "vendor_product": "fedoraproject:fedora"
        }
    ]
}

References

Affected packages

Git / github.com/pygments/pygments

Affected ranges

Type

GIT

Repo

https://github.com/pygments/pygments

Events

Introduced

f534f990331df660f5a5ea6947943e184672ac51

Fixed

4d555d0fffc914a2a4ac9874416cdaaf8f8c9e74

Fixed

2e7e8c4a7b318f4032493773732754e418279a14

Database specific

Show details

{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:pygments:pygments:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "1.1"
                },
                {
                    "fixed": "2.7.4"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "range": [
                {
                    "fixed": "2e7e8c4a7b318f4032493773732754e418279a14"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27291.json"