Bug 2449587 (CVE-2026-33128) - CVE-2026-33128 h3: H3: Server-Sent Events injection due to improper newline sanitization
Summary: CVE-2026-33128 h3: H3: Server-Sent Events injection due to improper newline s...
Keywords:
Status: NEW
Alias: CVE-2026-33128
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2449661
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-20 11:02 UTC by OSIDB Bzimport
Modified: 2026-03-20 17:19 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-03-20 11:02:32 UTC 
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.
Note You need to log in before you can comment on or make changes to this bug.