Security readout for executives and security teams
Plain-English summary
Hono applications using the IP Restriction Middleware before version 4.11.7 may incorrectly accept malformed IPv4 addresses. This can let an unauthenticated attacker bypass IP-based allow or deny rules in some deployments. The issue is rated medium by the source data and is patched in Hono 4.11.7.
Executive priority
Treat as a targeted remediation item for Hono-backed services that use IP allowlists or denylists. Prioritize systems where IP restrictions protect administrative, internal, or sensitive endpoints. Broad emergency response is not indicated by the provided evidence.
Technical view
The flaw is in Hono’s IPv4 validation logic. The advisory states `IPV4_REGEX` and `convertIPv4ToBinary` did not ensure IPv4 octets stayed within 0-255. That validation gap can cause malformed IPv4 values to bypass IP restriction checks. CVSS is 4.8, network exploitable, high complexity, no privileges or user interaction required.
Likely exposure
Exposure is limited to projects using honojs/hono versions earlier than 4.11.7 and specifically relying on IP Restriction Middleware for access control. Applications not using that middleware are less likely to be directly affected based on the provided sources.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not state active exploitation. Successful abuse depends on application routing, proxy/header handling, and whether IP-based restrictions protect sensitive functions. The CVSS vector rates attack complexity as high.
Researcher notes
This is a validation bypass mapped to CWE-185. The key review area is IPv4 parsing and boundary enforcement in `src/utils/ipaddr.ts`. Avoid assuming universal impact across all Hono apps; the relevant exposure is use of IP Restriction Middleware before the patched release.
Mitigation direction
- Upgrade honojs/hono to version 4.11.7 or later.
- Review the GitHub security advisory and release notes for vendor guidance.
- Identify services relying on Hono IP Restriction Middleware for access control.
- Consider layered authorization instead of relying only on source IP checks.
Validation and detection
- Inventory Hono versions across applications and dependency manifests.
- Confirm whether IP Restriction Middleware is used in each application.
- Verify production deployments run Hono 4.11.7 or later.
- Review access-control tests covering malformed IPv4 input handling.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-185: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-24398 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N2.22.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/honojs/hono/security/advisories/GHSA-r354-f388-2fhhCVE reference · x_refsource_CONFIRM
- https://github.com/honojs/hono/commit/edbf6eea8e6c26a3937518d4ed91d8666edeec37CVE reference · x_refsource_MISC
- https://github.com/honojs/hono/releases/tag/v4.11.7CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Regular Expression
Incorrect Regular Expression represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.