Is CVE-2026-47675 in the CISA KEV catalog?

No. CVE-2026-47675 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-47675?

CVE-2026-47675 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-47675?

CVE-2026-47675 has an EPSS score of 0.22% (12th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-47675?

Upgrade hono to 4.12.21 or later.

CVE & CISA-KEV Catalog

CVE-2026-47675

MEDIUM

4.3

CVSS v3

NVD

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the serialize() function in hono/cookie validates domain and path options against characters that corrupt Set-Cookie header syntax (;, \r, \n), but does not apply the same validation to sameSite and priority. An application that passes user-controlled input into either option may produce a Set-Cookie response header containing attacker-chosen additional attributes. This vulnerability is fixed in 4.12.21.

CWE-113 CWE-1287Improper Validation of Specified Type of Input

How to fix

Remediation Available

honoNVD

Affected:< 4.12.21Fixed in:4.12.21CVE-2026-47675derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

0.22%probability of exploitation in 30 days

12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Vendor Advisory1

github.com

Embed a live status badge for CVE-2026-47675

Markdown

[![CVE-2026-47675](https://tridentstack.com/cve/badge/CVE-2026-47675.svg)](https://tridentstack.com/cve/CVE-2026-47675)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-47675"><img src="https://tridentstack.com/cve/badge/CVE-2026-47675.svg" alt="CVE-2026-47675"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-29.