CVE-2026-39409 | honojs hono up to 4.12.11 ipRestriction incorrect behavior order: validate before canonicalize

VDB-356252 · CVE-2026-39409 · GCVE-0-2026-39409 HONOJS HONO UP TO 4.12.11 IPRESTRICTION INCORRECT BEHAVIOR ORDER: VALIDATE BEFORE CANONICALIZE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.37+ Summaryinfo A vulnerability categorized as problematic has been discovered in honojs hono up to 4.12.11. The affected element is the function ipRestriction. Such manipulation leads to incorrect behavior order: validate before canonicalize. This vulnerability is uniquely identified as CVE-2026-39409. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component. Detailsinfo A vulnerability was found in honojs hono up to 4.12.11 and classified as problematic. Affected by this issue is the function ipRestriction. The manipulation with an unknown input leads to a incorrect behavior order: validate before canonicalize vulnerability. Using CWE to declare the problem leads to CWE-180. The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the canonicalization step. Impacted is confidentiality. CVE summarizes: Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-39409 since 04/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. Upgrading to version 4.12.12 eliminates this vulnerability. Productinfo Vendor honojs Name hono Version 4.12.0 4.12.1 4.12.2 4.12.3 4.12.4 4.12.5 4.12.6 4.12.7 4.12.8 4.12.9 4.12.10 4.12.11 Website Product: https://github.com/honojs/hono/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Incorrect behavior order: validate before canonicalize CWE: CWE-180 / CWE-179 / CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: hono 4.12.12 Timelineinfo 04/07/2026 CVE reserved 04/08/2026 +1 days Advisory disclosed 04/08/2026 +0 days VulDB entry created 04/08/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-39409 (🔒) GCVE (CVE): GCVE-0-2026-39409 GCVE (VulDB): GCVE-100-356252 Entryinfo Created: 04/08/2026 17:21 Changes: 04/08/2026 17:21 (66) Complete: 🔍 Cache ID: 99:56D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸