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.
CVE-2026-29085
MEDIUMPre-NVD 6.56.5
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(low)
- EG Risk
- 34(Track)EG Risk 34/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 15%
- KEV
- Not listed
Published
March 4, 2026
Last Modified
June 17, 2026
References (2)
- security-advisories@githubhttps://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e
- security-advisories@githubhttps://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| hono | — | 4.12.4 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 1× in last 7d / 1× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-27 13:52 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-74
- CVE-2014-8423EG 10.0EPSS p99HIGH
- CVE-2015-10062NVD 5.5EG 9.8CRITICAL
- CVE-2015-10027NVD 5.5EG 9.8CRITICAL
- CVE-2016-15007NVD 5.5EG 9.8CRITICAL
- CVE-2016-15004NVD 7.3EG 9.8CRITICAL
- CVE-2013-4144EG 9.8CRITICAL
- CVE-2013-7487EG 9.8CRITICAL
- CVE-2014-4678EG 9.8EPSS p92CRITICAL
- CVE-2014-4967EG 9.8CRITICAL
- CVE-2014-4966EG 9.8CRITICAL
Frequently asked(5)
What is CVE-2026-29085?
CVE-2026-29085 is a medium vulnerability published on March 4, 2026. 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…
When was CVE-2026-29085 disclosed?
CVE-2026-29085 was first published in the National Vulnerability Database on March 4, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-29085 actively exploited?
CVE-2026-29085 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.8% of all scored CVEs.
What is the CVSS score of CVE-2026-29085?
CVE-2026-29085 has a CVSS v3 base score of 6.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-29085?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-29085, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-29085
Is Your Infrastructure Affected by CVE-2026-29085?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.