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Vulnerability details: VCID-rcau-p84w-3bgs
Vulnerability ID VCID-rcau-p84w-3bgs
Aliases CVE-2026-29045
GHSA-q5qw-h33p-qvwr
Summary Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to be accessed without authorization. The router used decodeURI, while serveStatic used decodeURIComponent. This mismatch allowed paths containing encoded slashes (%2F) to bypass middleware protections while still resolving to the intended filesystem path. This issue has been patched in version 4.12.4.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-177 Improper Handling of URL Encoding (Hex Encoding)
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 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-29045
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-29045
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-29045
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-q5qw-h33p-qvwr
cvssv3.1 7.5 https://github.com/honojs/hono
generic_textual HIGH https://github.com/honojs/hono
cvssv3.1 7.5 https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
generic_textual HIGH https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
ssvc Track https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
cvssv3.1 7.5 https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
cvssv3.1_qr HIGH https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
generic_textual HIGH https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
ssvc Track https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2026-29045
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-29045
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-29045
https://github.com/honojs/hono
6a0607a929d888893f0c91d92dce2fcfdb3662a3 https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
CVE-2026-29045 https://nvd.nist.gov/vuln/detail/CVE-2026-29045
GHSA-q5qw-h33p-qvwr https://github.com/advisories/GHSA-q5qw-h33p-qvwr
GHSA-q5qw-h33p-qvwr https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
No exploits are available.
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
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: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/6a0607a929d888893f0c91d92dce2fcfdb3662a3
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-05T15:39:29Z/ Found at https://github.com/honojs/hono/commit/6a0607a929d888893f0c91d92dce2fcfdb3662a3
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-q5qw-h33p-qvwr
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: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-05T15:39:29Z/ Found at https://github.com/honojs/hono/security/advisories/GHSA-q5qw-h33p-qvwr
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-29045
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.1595
EPSS Score 0.0005
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:46:56.123076+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/29xxx/CVE-2026-29045.json 38.6.0