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    CVE-2026-47676

    Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte characters, resulting in the mounted sub-application receiving an incorrect path. This vulnerability is fixed in 4.12.21.

    Published:May 28, 2026
    Last Modified:May 29, 2026
    EPS:May 28, 2026
    EPSS Score:0.00048
    CVSS Score:5.3

    Affected Products

    Vendor
    Hono
    Product
    Hono

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
    CAPEC-107 Cross Site Tracing
    CAPEC-127 Directory Indexing
    CAPEC-17 Using Malicious Files
    CAPEC-20 Encryption Brute Forcing
    CAPEC-22 Exploiting Trust in Client
    CAPEC-237 Escaping a Sandbox by Calling Code in Another Language
    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling
    CAPEC-36 Using Unpublished Interfaces or Functionality
    CAPEC-477 Signature Spoofing by Mixing Signed and Unsigned Content
    CAPEC-480 Escaping Virtualization
    CAPEC-51 Poison Web Service Registry
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-65 Sniff Application Code
    CAPEC-668 Key Negotiation of Bluetooth Attack (KNOB)
    CAPEC-74 Manipulating State
    CAPEC-87 Forceful Browsing

    Related CVEs

    CVE-2026-84365 (CVSS 6.5) — Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.12 until 4.13.…
    CVE-2026-84364 (CVSS 5.3) — Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.5, when pa…
    CVE-2026-84363 (CVSS 5.9) — Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.13.5, Hono's …
    CVE-2026-69207 (CVSS 5.3) — Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.34, the bu…
    CVE-2026-71850 (CVSS 4.8) — Hono is a Web application framework that provides support for any JavaScript runtime. From 3.8.0 to 4.12.33, m…
    CVE-2026-71849 (CVSS 3.7) — Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, t…
    CVE-2026-71848 (CVSS 5.3) — Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.0 to 4.12.33, …
    CVE-2026-56764 (CVSS 6.3) — Hono before 4.11.10 contains a timing attack vulnerability in the basicAuth and bearerAuth middlewares due to …
    CVE-2026-56763 (CVSS 6.3) — Hono before 4.12.7 allows __proto__ key in parseBody with dot option enabled, permitting specially crafted for…
    CVE-2026-59895 (CVSS 6.1) — Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.2…

    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