CVE-2026-39408Disclosure(hono / hono)

LOWCVSS 7.5 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path traversal issue in toSSG() allows files to be written outside the configured output directory during static site generation. When using dynamic route parameters via ssgParams, specially crafted values can cause generated file paths to escape the intended output directory. This vulnerability is fixed in 4.12.12.

hono CVEs Back to dashboard

1.5/ 10 priority

Sources & remediation

Patch / fix

https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679

Exploit / PoC references

https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx

Other references

https://github.com/honojs/hono/releases/tag/v4.12.12

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

hono

Threat summary

Public PoC is present in monitored signal
4 mentions across 2 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 1 signal
Technical details provided in 3 signals
Disclosure: 3 classified signals
General: 1 classified signal
Peaked 1d ago at 3 mentions (2026-04-08); latest day: 1
4 total mentions across 2 days

Affected systems

Vendors

hono

Products

hono

Deep dive

Activity timeline4 mentions / 2d

Signal classification2 categories

Disclosure

375.0%

General

125.0%

Referenced assets5 URLs

By indicator

Classification over time

Date	Total	Labels

2026-04-08	3	Disclosure2General1
2026-04-09	1	Disclosure1

Full discourse4 posts

r74tech@r74tech183d
Disclosure
Hono の脆弱性を2件報告し、CVE が発行されました。 CVE-2026-39409: https://github.com/advisories/GHSA-xpcf-pg52-r92g CVE-2026-39408: https://github.com/advisories/GHSA-xf4j-xp2r-rqqx https://t.co/KGn4XJ2KRi
Post summary
Two Hono vulnerabilities (CVE-2026-39409 and CVE-2026-39408) have been disclosed, with advisory links provided on GitHub.
17072119.3K
362 followersView on X
Vulmon Vulnerability Feed@VulmonFeeds184d
Disclosure
CVE-2026-39408 Path Traversal in Hono Web Framework Prior to Version 4.12.12 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-39408
Post summary
The text announces a path traversal vulnerability in Hono Web Framework versions earlier than 4.12.12, providing minimal technical details and referencing an external vulnerability details page.
0010053
4.0K followersView on X
Infoflowcloud@infoflowcloud184d
Disclosure
🚨*CVE* CVE-2026-39408 Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path traversal issue in toSSG() allows files to be written o… https://www.cve.org/CVERecord?id=CVE-2026-39408 ----- Traducción: CVE-2026-39408 Hon… http://infoflow.cloud`
Post summary
The tweet announces CVE-2026-39408, describing a path traversal flaw in Hono that allows arbitrary file writes before v4.12.12, without mentioning PoC, active exploitation, or patches.
0000030
67 followersView on X
CVE@CVEnew184d
General
CVE-2026-39408 Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a path traversal issue in toSSG() allows files to be written o… https://www.cve.org/CVERecord?id=CVE-2026-39408
Post summary
A brief disclosure describes a path traversal vulnerability in Hono framework before v4.12.12, but without additional details such as PoC, exploit, or patch information.
00000117
57.0K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	hono	hono	-	node.js	-

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What researchers are saying

CVE-2026-39408

r74tech@r74techDisclosure

Two Hono vulnerabilities (CVE-2026-39409 and CVE-2026-39408) have been disclosed, with advisory links provided on GitHub.

Vulmon Vulnerability Feed@VulmonFeedsDisclosure

The text announces a path traversal vulnerability in Hono Web Framework versions earlier than 4.12.12, providing minimal technical details and referencing an external vulnerability details page.

Infoflowcloud@infoflowcloudDisclosure

The tweet announces CVE-2026-39408, describing a path traversal flaw in Hono that allows arbitrary file writes before v4.12.12, without mentioning PoC, active exploitation, or patches.

CVE@CVEnewGeneral

A brief disclosure describes a path traversal vulnerability in Hono framework before v4.12.12, but without additional details such as PoC, exploit, or patch information.