FKIE_CVE-2026-33128

Vulnerability from fkie_nvd - Published: 2026-03-20 10:16 - Updated: 2026-03-20 20:00
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/h3js/h3/blob/52c82e18bb643d124b8b9ec3b1f62b081f044611/src/utils/internal/event-stream.ts#L170-L187Product
security-advisories@github.comhttps://github.com/h3js/h3/commit/7791538e15ca22437307c06b78fa155bb73632a6Patch
security-advisories@github.comhttps://github.com/h3js/h3/security/advisories/GHSA-22cc-p3c6-wpvmExploit, Vendor Advisory
Impacted products
Vendor Product Version
h3 h3 *
h3 h3 2.0.0
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
h3 h3 2.0.1
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.