CVE-2025-45526
lowpriority · track · 0EPSS 0.001 · 3 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
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weaknesses
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affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-wgc6-9f6w-h8hxWithdrawn Advisory: microlight allows a denial of service2025-06-17ghsa · osvUS
## Withdrawn Advisory This advisory has been withdrawn because the proof of concept does not demonstrate a practical security impact. This link is maintained to preserve external references. ## Original Description 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.
also known as (3)
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sources
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references (7)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-45526cnnvd
- https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2acnnvd
- https://github.com/github/advisory-database/pull/5730cnnvd
- https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2aenisa_euvd
- https://github.com/github/advisory-database/pull/5730enisa_euvd
- https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2anvd
- https://github.com/github/advisory-database/pull/5730nvd
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