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Vulnerability details: VCID-36hs-1ykr-xbcs
Vulnerability ID VCID-36hs-1ykr-xbcs
Aliases CVE-2026-29086
GHSA-5pq2-9x2x-5p6w
Summary Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, the setCookie() utility did not validate semicolons (;), carriage returns (\r), or newline characters (\n) in the domain and path options when constructing the Set-Cookie header. Because cookie attributes are delimited by semicolons, this could allow injection of additional cookie attributes if untrusted input was passed into these fields. This issue has been patched in version 4.12.4.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1113 Inappropriate Comment Style
CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
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 0.0004 https://api.first.org/data/v1/epss?cve=CVE-2026-29086
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-5pq2-9x2x-5p6w
cvssv3.1 5.4 https://github.com/honojs/hono
generic_textual MODERATE https://github.com/honojs/hono
cvssv3.1 5.4 https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
generic_textual MODERATE https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
ssvc Track https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
cvssv3.1 5.4 https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
cvssv3.1_qr MODERATE https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
generic_textual MODERATE https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
ssvc Track https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2026-29086
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-29086
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-29086
https://github.com/honojs/hono
44ae0c8cc4d5ab2bed529127a4ac72e1483ad073 https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
CVE-2026-29086 https://nvd.nist.gov/vuln/detail/CVE-2026-29086
GHSA-5pq2-9x2x-5p6w https://github.com/advisories/GHSA-5pq2-9x2x-5p6w
GHSA-5pq2-9x2x-5p6w https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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:R/S:U/C:L/I:L/A:N Found at https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
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:N/T:P/P:M/B:A/M:M/D:T/2026-03-05T15:29:14Z/ Found at https://github.com/honojs/hono/commit/44ae0c8cc4d5ab2bed529127a4ac72e1483ad073
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Found at https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
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:N/T:P/P:M/B:A/M:M/D:T/2026-03-05T15:29:14Z/ Found at https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-29086
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 0.12659
EPSS Score 0.0004
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:46:55.731083+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/29xxx/CVE-2026-29086.json 38.6.0