CVE-2026-33128

HIGH

7.5

Description

H3 is a minimal H(TTP) framework. In versions prior to 1.15.6 and between 2.0.0 through 2.0.1-rc.14, createEventStream is vulnerable to Server-Sent Events (SSE) injection due to missing newline sanitization in formatEventStreamMessage() and formatEventStreamComment(). An attacker who controls any part of an SSE message field (id, event, data, or comment) can inject arbitrary SSE events to connected clients. This issue is fixed in versions 1.15.6 and 2.0.1-rc.15.

Details CVE

Score CVSS v3.17.5

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N

Vecteur d'attaqueNETWORK

ComplexiteHIGH

Privileges requisNONE

Interaction utilisateurNONE

Publie3/20/2026

Derniere modification3/20/2026

Sourcenvd

Observations honeypot0

Produits affectes

h3:h3

Faiblesses (CWE)

CWE-93

References

https://github.com/h3js/h3/blob/52c82e18bb643d124b8b9ec3b1f62b081f044611/src/utils/internal/event-stream.ts#L170-L187(security-advisories@github.com)

https://github.com/h3js/h3/commit/7791538e15ca22437307c06b78fa155bb73632a6(security-advisories@github.com)

https://github.com/h3js/h3/security/advisories/GHSA-22cc-p3c6-wpvm(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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