Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-tqjc-xv4n-5yb4
Vulnerability ID VCID-tqjc-xv4n-5yb4
Aliases CVE-2026-29085
GHSA-p6xx-57qc-3wxr
Summary Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using streamSSE() in Streaming Helper, the event, id, and retry fields were not validated for carriage return (\r) or newline (\n) characters. Because the SSE protocol uses line breaks as field delimiters, this could allow injection of additional SSE fields within the same event frame 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 (3)
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
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 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2026-29085
epss 0.0006 https://api.first.org/data/v1/epss?cve=CVE-2026-29085
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-p6xx-57qc-3wxr
cvssv3.1 6.5 https://github.com/honojs/hono
generic_textual MODERATE https://github.com/honojs/hono
cvssv3.1 6.5 https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
generic_textual MODERATE https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
ssvc Track https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
cvssv3.1 6.5 https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
cvssv3.1_qr MODERATE https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
generic_textual MODERATE https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
ssvc Track https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2026-29085
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-29085
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-29085
https://github.com/honojs/hono
CVE-2026-29085 https://nvd.nist.gov/vuln/detail/CVE-2026-29085
f4123ed9ea3c7c52380cc99a079a4d773838846e https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
GHSA-p6xx-57qc-3wxr https://github.com/advisories/GHSA-p6xx-57qc-3wxr
GHSA-p6xx-57qc-3wxr https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N/S:U/C:L/I:L/A:N Found at https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
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/2026-03-05T15:39:27Z/ Found at https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
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/2026-03-05T15:39:27Z/ Found at https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-29085
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 0.19078
EPSS Score 0.0006
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:46:57.730395+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/29xxx/CVE-2026-29085.json 38.6.0