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Vulnerability record · CVE-2026-29085 · published 4 March 2026

CVE-2026-29085: Hono injection vulnerability

Hono · Hono

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.

6.5 CVSS 3.1 Medium EPSS 0.29% · top 80.5% CWE-74 · Injection
6.5CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e Patch
https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-29045Hono vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with r…EPSS 0.60%8.1CVE-2025-62610Hono improper authorization vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. In versions from 1.1.0 to before 4.10.2, Hono’s JWT Auth Middle…EPSS 0.38%7.5CVE-2026-27700Hono authentication bypass by spoofing vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapte…EPSS 0.34%7.5CVE-2025-58362Hono vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Versions 4.8.0 through 4.9.5 contain a flaw in the getPath util…EPSS 0.53%6.5CVE-2026-59896Hono race condition vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. From 4.11.8 before 4.12.27, hono/jsx did not isolate context va…EPSS 0.30%6.5CVE-2026-47673Hono improper authorization vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify tha…EPSS 0.25%6.5CVE-2026-44456Hono uncontrolled resource consumption vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, bodyLimit() does not reliably enforce maxSize…EPSS 0.28%6.5CVE-2026-24398Hono vulnerabilityHono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, IP Restriction Middleware in Hono is v…EPSS 0.35%

Source: NIST National Vulnerability Database (record CVE-2026-29085), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.