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CVE-2026-8888

HighPublished

Version 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as JavaScript regular expressions via...

Published: Jun 3, 2026
Updated: Jun 4, 2026
Assigning CNA: certcc
Evidence observed: Aug 10, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 36.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Version 3.0.7 of the Securly Chrome Extension downloads config.json over HTTP and compiles server-provided patterns as JavaScript regular expressions via new RegExp() without complexity validation. An on-path attacker can inject specific patterns to cause catastrophic backtracking, resulting in denial of service on all browsing.

Sources

CVE-2026-8888-Printer-Firmware-Unsigned-Update-via-HTTPPoC
Demonstrates CVE-2026-8888, an unsigned printer firmware update over HTTP, including a malicious update server and vulnerable printer emulator for testing update integrity.

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