CVE-2026-8888
Analyzed Analyzed - Analysis Complete
Securly Chrome Extension Regex DoS via HTTP Config

Publication date: 2026-06-03

Last updated on: 2026-06-05

Assigner: CERT/CC

Description
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.
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Meta Information
Published
2026-06-03
Last Modified
2026-06-05
Generated
2026-06-24
AI Q&A
2026-06-03
EPSS Evaluated
2026-06-22
NVD
CVE-2026-8888
EUVD
EUVD-2026-34168
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
securly securly 3.0.7
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-917 The product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.
CWE-1333 The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
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Executive Summary

Version 3.0.7 of the Securly Chrome Extension downloads a configuration file (config.json) over an unencrypted HTTP connection. It then compiles server-provided patterns into JavaScript regular expressions using new RegExp() without checking the complexity of these patterns.

Because of this, an attacker positioned on the network path (on-path attacker) can inject malicious patterns that cause catastrophic backtracking in the regular expressions, leading to a denial of service (DoS) affecting all browsing activities.

Impact Analysis

This vulnerability can cause a denial of service on all browsing by exploiting the way the extension processes regular expressions. An attacker who can intercept or modify the HTTP traffic can inject malicious patterns that cause the extension to hang or crash, disrupting normal browsing functionality.

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