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CVE-2026-4539— pygments archetype.py AdlLexer redos

Quick assessment

Affected
n/a pygments
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 3.3 · Low EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-4539

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Vendor Advisories for CVE-2026-4539 (3)

Other References for CVE-2026-4539 (1)

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

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-1333

V. Comments for CVE-2026-4539

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