CVE-2026-4539— pygments archetype.py AdlLexer redos
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I. Basic Information for CVE-2026-4539
Vulnerability Information
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Vulnerability Title
pygments archetype.py AdlLexer redos
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1333
Source: NVD (National Vulnerability Database)
Vulnerability Title
Matthäus G. Chajdas pygments 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matthäus G. Chajdas pygments是 Matthäus G. Chajdas开源的一个应用软件。提供通用语法突出显示工具功能。 Matthäus G. Chajdas pygments 2.19.2及之前版本存在安全漏洞，该漏洞源于文件pygments/lexers/archetype.py中函数AdlLexer存在低效正则表达式复杂性，可能导致正则表达式拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | pygments | 2.19.0 | - |
II. Public POCs for CVE-2026-4539
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Submit #774685: pygments <=2.19.2 Denial of Servicethird-party-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-4539
Same Patch Batch · n/a · 2026-03-22 · 7 CVEs total
| CVE-2026-4562 | 7.3 HIGH | MacCMS Timming API Endpoint Timming.php weak authentication |
| CVE-2026-4542 | 5.4 MEDIUM | SSCMS layerImage Endpoint LayerImageController.Submit.cs path traversal |
| CVE-2026-4538 | 5.3 MEDIUM | PyTorch pt2 Loading deserialization |
| CVE-2026-4531 | 5.3 MEDIUM | Free5GC AMF handler.go HandleRegistrationComplete denial of service |
| CVE-2026-4563 | 4.3 MEDIUM | MacCMS Member Order Detail User.php order_info authorization |
| CVE-2026-4115 | 3.7 LOW | PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification |
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Same weakness: CWE-1333
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