Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-q2gc-djt2-a3e9
Vulnerability ID VCID-q2gc-djt2-a3e9
Aliases CVE-2026-39408
GHSA-xf4j-xp2r-rqqx
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-39408
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-39408
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2026-39408
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-xf4j-xp2r-rqqx
cvssv4 5.9 https://github.com/honojs/hono
generic_textual MODERATE https://github.com/honojs/hono
cvssv3.1 7.5 https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
cvssv4 5.9 https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
generic_textual MODERATE https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
ssvc Track https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
cvssv3.1 7.5 https://github.com/honojs/hono/releases/tag/v4.12.12
cvssv4 5.9 https://github.com/honojs/hono/releases/tag/v4.12.12
generic_textual MODERATE https://github.com/honojs/hono/releases/tag/v4.12.12
ssvc Track https://github.com/honojs/hono/releases/tag/v4.12.12
cvssv3.1 7.5 https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
cvssv3.1_qr MODERATE https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
cvssv4 5.9 https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
generic_textual MODERATE https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
ssvc Track https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
cvssv4 5.9 https://nvd.nist.gov/vuln/detail/CVE-2026-39408
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-39408
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-39408
https://github.com/honojs/hono
https://nvd.nist.gov/vuln/detail/CVE-2026-39408
b470278920fffcfd6d76002755d6db53db827679 https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
GHSA-xf4j-xp2r-rqqx https://github.com/advisories/GHSA-xf4j-xp2r-rqqx
GHSA-xf4j-xp2r-rqqx https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
v4.12.12 https://github.com/honojs/hono/releases/tag/v4.12.12
No exploits are available.
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/honojs/hono
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T20:31:12Z/ Found at https://github.com/honojs/hono/commit/b470278920fffcfd6d76002755d6db53db827679
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/honojs/hono/releases/tag/v4.12.12
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/honojs/hono/releases/tag/v4.12.12
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T20:31:12Z/ Found at https://github.com/honojs/hono/releases/tag/v4.12.12
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T20:31:12Z/ Found at https://github.com/honojs/hono/security/advisories/GHSA-xf4j-xp2r-rqqx
Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-39408
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.04404
EPSS Score 0.00017
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:45:57.289784+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/39xxx/CVE-2026-39408.json 38.6.0