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Vulnerability details: VCID-uwfg-jrfw-s7cc
Vulnerability ID VCID-uwfg-jrfw-s7cc
Aliases CVE-2026-39409
GHSA-xpcf-pg52-r92g
Summary 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.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-180 Incorrect Behavior Order: Validate Before Canonicalize
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 0.00013 https://api.first.org/data/v1/epss?cve=CVE-2026-39409
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-xpcf-pg52-r92g
cvssv3.1 5.3 https://github.com/honojs/hono
cvssv4 6.3 https://github.com/honojs/hono
generic_textual MODERATE https://github.com/honojs/hono
cvssv3.1 5.3 https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
cvssv4 6.3 https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
generic_textual MODERATE https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
ssvc Track https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
cvssv3.1 5.3 https://github.com/honojs/hono/releases/tag/v4.12.12
cvssv4 6.3 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 5.3 https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
cvssv3.1_qr MODERATE https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
cvssv4 6.3 https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
generic_textual MODERATE https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
ssvc Track https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-39409
cvssv4 6.3 https://nvd.nist.gov/vuln/detail/CVE-2026-39409
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-39409
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-39409
https://github.com/honojs/hono
https://nvd.nist.gov/vuln/detail/CVE-2026-39409
48fa2233bc092f650119f42df043050737cabf39 https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
GHSA-xpcf-pg52-r92g https://github.com/advisories/GHSA-xpcf-pg52-r92g
GHSA-xpcf-pg52-r92g https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
v4.12.12 https://github.com/honojs/hono/releases/tag/v4.12.12
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://github.com/honojs/hono
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:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/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:L/I:N/A:N Found at https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
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:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
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:N/T:P/P:M/B:A/M:M/D:T/2026-04-08T16:08:52Z/ Found at https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/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:N/T:P/P:M/B:A/M:M/D:T/2026-04-08T16:08:52Z/ 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:L/I:N/A:N Found at https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
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:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
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:N/T:P/P:M/B:A/M:M/D:T/2026-04-08T16:08:52Z/ Found at https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-39409
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:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-39409
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 0.02368
EPSS Score 0.00013
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:46:05.577863+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/39xxx/CVE-2026-39409.json 38.6.0