> CVE-2026-29085 [MEDIUM]

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PUBLISHED
2026-03-04 23:16
MODIFIED
2026-03-04 23:16
CVSS_SCORE V3
6.5
EPSS (Prob. Exploit)
0.28%
Top 79.3%
DATA SOURCES:
NVD 🔗 2026-03-05 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 GITHUB 🔗 2026-11-05 OSV 🔗 2026-11-08

> 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EXPLOITABILITY
3.9
IMPACT
2.5

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-74

> CWE DETAILED DESCRIPTIONS

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component - The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

> GITHUB SECURITY ADVISORY

GHSA-p6xx-57qc-3wxr MODERATE

Hono Vulnerable to SSE Control Field Injection via CR/LF in writeSSE()

AFFECTED PACKAGES:
NPM / hono
< 4.12.4
Fixed in: 4.12.4

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Hono: SSE Control Field Injection via CR/LF in writeSSE()

AFFECTED PACKAGES:
Unknown / Unknown
389 versions affected
ALIASES:
GHSA-p6xx-57qc-3wxr

> HISTORIQUE DES MODIFICATIONS

Première apparition
04/03/2026 23:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:58
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') - The product constructs all or part of a command, data structure, or record using externally...
Nouvelle valeur:
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component - The product constructs all or part of a command, data structure, or record using externally-influenced in...
📊 ENRICHISSEMENT 01/04/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') - The product constructs all or part of a command, data structure, or record using externally...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

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