CVE-2026-29085
Medium · 6.5CVSS
6.5
EPSS
0.3%
Published
Mar 4, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | hono | 0 | 4.12.4 |
| Chainguard | hono | 0 | 0 |
| Chainguard | hono-adapter-mqtt | 0 | 0 |
| Chainguard | hono-cli | 0 | 0 |
| Chainguard | hono-compat | 0 | 0 |
| Chainguard | hono-service-auth | 0 | 0 |
| Chainguard | hono-service-command-router | 0 | 0 |
| Chainguard | hono-service-device-registry-jdbc | 0 | 0 |
| Chainguard | kibana-9.1 | 0 | 9.1.10-r7 |
| Chainguard | kibana-9.1-iamguarded | 0 | 9.1.10-r7 |
| Chainguard | librechat | 0 | 0.8.3-r1 |
| Chainguard | opensearch-dashboards-2 | 0 | 2.19.5-r3 |
| Chainguard | opensearch-dashboards-2-fips | 0 | 2.19.5-r1 |
| Wolfi | opensearch-dashboards-2 | 0 | 2.19.5-r3 |
Related vulnerabilities
- GHSA-p6xx-57qc-3wxr Hono Vulnerable to SSE Control Field Injection via CR/LF in writeSSE() Same vulnerability
- CVE-2026-54288 Hono is a Web application framework that provides support for any JavaScript runtime. Also affects hono
- CVE-2026-54289 Hono is a Web application framework that provides support for any JavaScript runtime. Also affects hono
- CVE-2026-54286 Hono is a Web application framework that provides support for any JavaScript runtime. Also affects hono
- CVE-2026-54290 Hono is a Web application framework that provides support for any JavaScript runtime. Also affects hono
- CVE-2026-54287 Hono is a Web application framework that provides support for any JavaScript runtime. Also affects hono
- GHSA-rv63-4mwf-qqc2 hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length` Also affects hono
- GHSA-wgpf-jwqj-8h8p hono: Lambda@Edge adapter keeps only the last value of a repeated request header… Also affects hono