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VULNERABILITIES

CVE-2026-33128 Details

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.

Metrics

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/h3js/h3/blob/52c82e18bb643d124b8b9ec3b1f62b081f044611/src/utils/internal/event-stream.ts#L170-L187 [email protected]Product
https://github.com/h3js/h3/commit/7791538e15ca22437307c06b78fa155bb73632a6 [email protected]Patch
https://github.com/h3js/h3/security/advisories/GHSA-22cc-p3c6-wpvm [email protected]ExploitVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')[email protected]

Affected Products

ProductVersions
h3 h3
< 1.15.6
2.0.0
2.0.1 rc10
2.0.1 rc11
2.0.1 rc12

CPE

  • cpe:2.3:a:h3:h3:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.0:*:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc10:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc11:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc12:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc13:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc14:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc2:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc3:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc4:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc5:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc6:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc7:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc8:*:*:*:node.js:*:*
  • cpe:2.3:a:h3:h3:2.0.1:rc9:*:*:*:node.js:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-33128
NVD Published Date:
Mar 20, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-33128 Details - Not Deferred