CVE-2026-4539

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Source
https://cve.org/CVERecord?id=CVE-2026-4539
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-4539.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-4539
Aliases
Downstream
Related
Published
2026-03-22T05:35:12.096Z
Modified
2026-06-18T03:56:42.835505466Z
Severity
  • 1.9 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
Summary
pygments archetype.py AdlLexer redos
Details

A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Database specific 
{
    "cna_assigner": "VulDB",
    "cwe_ids": [
        "CWE-1333",
        "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4539.json"
}
References

Affected packages

Git / github.com/pygments/pygments

Affected ranges

Type
GIT
Repo
https://github.com/pygments/pygments
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
62dff316900a548aabf741d662b79edc39ed78b5
Last affected
b583de4794e94b4dc4c2da03a7c29f462482293e
Last affected
cfca62e6e95136e48a255e8cbffb0bbe1d98456c
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "2.19.0"
        },
        {
            "last_affected": "2.19.1"
        },
        {
            "last_affected": "2.19.2"
        }
    ]
}

Affected versions

2.*
2.1.1
2.10.0
2.11.0
2.11.1
2.11.2
2.12.0
2.13.0
2.14.0
2.15.0
2.15.1
2.16.0
2.16.1
2.17.0
2.17.1
2.18.0
2.19.0
2.19.1
2.19.2
2.4.1
2.4.2
2.5.0
2.5.1
2.5.2
2.6.0
2.6.1
2.7.0
2.7.1
2.7.2
2.7.3
2.7.4
2.8.0
2.9.0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-4539.json"