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    CVE-2026-8888

    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.

    Published:Jun 3, 2026
    Last Modified:Jun 5, 2026
    EPS:Jun 3, 2026
    EPSS Score:0.0004
    CVSS Score:7.5

    Affected Products

    Vendor
    Securly
    Product
    Securly
    Vendor
    Securly
    Product
    Securly Chrome Extension

    Exploits

    https://github.com/George0Papasotiriou/CVE-2026-8888-Printer-Firmware-Unsigned-Update-via-HTTP

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    Related CVEs

    CVE-2026-8889 (CVSS 7.5) — Version 3.0.7 of the Securly Chrome Extension uses deprecated SHA-1 hashing for IWF CSAM URL matching (25,020 …
    CVE-2026-8881 (CVSS 7.5) — Version 3.0.7 of the Securly Chrome Extension uses EVP_BytesToKey key derivation with MD5 and a single iterati…
    CVE-2026-8879 (CVSS 7.5) — Version 3.0.7 of the Securly Chrome Extension dynamically registers content13.min.js as a content script via c…
    CVE-2026-8878 (CVSS 7.5) — Version 3.0.7 of the Securly Chrome Extension exposes multiple publicly accessible endpoints that allow unauth…
    CVE-2026-8876 (CVSS 7.3) — Version 3.0.7 of the Securly Chrome Extension contains hardcoded, plaintext AES passphrases in securly.min.js.…
    CVE-2026-8874 (CVSS 7.1) — Version 3.0.7 of the Securly Chrome Extension downloads JSON files containing crisis alert keywords and filter…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High