Medium
Hono: Cookie Attribute Injection via Unsanitized domain and path in setCookie()
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-29086
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 20:41 UTC · Revision 1
Source evidence
Hono: Cookie Attribute Injection via Unsanitized domain and path in setCookie()
core-osv · Original sourcePublished 4 Mar 2026, 22:09 UTC
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.
osv:CVE-2026-29086
Complete source record
{
"id": "a0c735e65932581e1421196830c9e304b759b4a5aafffee4f7de0a7a232dca81",
"url": "https://osv.dev/vulnerability/CVE-2026-29086",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Hono: Cookie Attribute Injection via Unsanitized domain and path in setCookie()",
"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.",
"evidence": "osv:CVE-2026-29086",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-29086",
"aliases": [
"CVE-2026-29086",
"GHSA-5pq2-9x2x-5p6w"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/honojs/hono",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "19d20d23a2921e26c3bbfdb5549fce98b4a39b28"
},
{
"fixed": "44ae0c8cc4d5ab2bed529127a4ac72e1483ad073"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*",
"range": [
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"introduced": "0"
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{
"fixed": "4.12.4"
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"source": "CPE_RANGE"
},
{
"range": [
{
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],
"source": "REFERENCES_COMMIT"
}
]
}
}
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],
"modified": "2026-10-28T02:30:23.500602755Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29086.json",
"https://github.com/honojs/hono/security/advisories/GHSA-5pq2-9x2x-5p6w",
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],
"provider_metadata": {
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29086.json"
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"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 489983,
"published_at": "2026-03-04T22:09:01.488+00:00"
}