Is CVE-2026-29085 actively exploited?

No active exploitation of CVE-2026-29085 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-29085 be exploited remotely?

Yes. CVE-2026-29085 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-29085?

CVE-2026-29085 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-29085

CWE-74Published: March 4, 2026· Updated: Mar 6, 2026

6.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.5th

Official 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.

NVD Source

Technical Analysis

CVE-2026-29085 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.