CVE-2025-45526

A denial of service (DoS) vulnerability has been identified in the JavaScript library microlight version 0.0.7. This library, used for syntax highlighting, does not limit the size of textual content it processes in HTML elements with the microlight class. When excessively large content (e.g., 100 million characters) is processed, the reset function in microlight.js consumes excessive memory and CPU resources, causing browser crashes or unresponsiveness. An attacker can exploit this vulnerability by tricking a user into visiting a malicious web page containing a microlight element with large content, resulting in a denial of service. NOTE: this is disputed by multiple parties because a large amount of memory and CPU resources is expected to be needed for content of that size.

CVSS v3 2.9 LOW

2.9^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.4 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2a
https://github.com/github/advisory-database/pull/5730
https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2a

Configurations

No configuration.

History

26 Jun 2025, 16:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-06-17 20:15

Updated : 2025-06-26 16:15

NVD link : CVE-2025-45526

Mitre link : CVE-2025-45526

CVE.ORG link : CVE-2025-45526

JSON object : View

Products Affected

No product.

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2025-45526", "cveTags": [{"tags": ["disputed"], "sourceIdentifier": "cve@mitre.org"}], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 2.9, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 1.4}]}, "published": "2025-06-17T20:15:32.243", "references": [{"url": "https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2a", "source": "cve@mitre.org"}, {"url": "https://github.com/github/advisory-database/pull/5730", "source": "cve@mitre.org"}, {"url": "https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2a", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "A denial of service (DoS) vulnerability has been identified in the JavaScript library microlight version 0.0.7. This library, used for syntax highlighting, does not limit the size of textual content it processes in HTML elements with the microlight class. When excessively large content (e.g., 100 million characters) is processed, the reset function in microlight.js consumes excessive memory and CPU resources, causing browser crashes or unresponsiveness. An attacker can exploit this vulnerability by tricking a user into visiting a malicious web page containing a microlight element with large content, resulting in a denial of service. NOTE: this is disputed by multiple parties because a large amount of memory and CPU resources is expected to be needed for content of that size."}, {"lang": "es", "value": "Se ha identificado una vulnerabilidad de denegaci\u00f3n de servicio (DoS) en la librer\u00eda de JavaScript microlight versi\u00f3n 0.0.7. Esta librer\u00eda, utilizada para el resaltado de sintaxis, no limita el tama\u00f1o del contenido textual que procesa en elementos HTML con la clase microlight. Cuando se procesa contenido excesivamente grande (p. ej., 100 millones de caracteres), la funci\u00f3n de reinicio de microlight.js consume una cantidad excesiva de memoria y recursos de CPU, lo que provoca bloqueos o incapacidad de respuesta del navegador. Un atacante puede explotar esta vulnerabilidad enga\u00f1ando al usuario para que visite una p\u00e1gina web maliciosa que contenga un elemento microlight con contenido extenso, lo que resulta en una denegaci\u00f3n de servicio."}], "lastModified": "2025-06-26T16:15:29.013", "sourceIdentifier": "cve@mitre.org"}