CVE-2026-44457

Q: How do I fix CVE-2026-44457?

Upgrade hono to 4.12.18 or later.

Q: Is CVE-2026-44457 being actively exploited?

Not that we know of. CVE-2026-44457 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.20% is the estimated probability that it will be exploited in the next 30 days. That is higher than 10% of all scored CVEs.

Q: How severe is CVE-2026-44457?

CVE-2026-44457 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-44457 affect?

Published advisories record a fix for hono (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.3

CVSS v3

NVD

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, Cache Middleware does not skip caching for responses that declare per-user variance via Vary: Authorization or Vary: Cookie. As a result, a response cached for one authenticated user may be served to subsequent requests from different users. This vulnerability is fixed in 4.12.18.

CWE-524

How to fix

Remediation Available

honoNVD

Affected:< 4.12.18Fixed in:4.12.18CVE-2026-44457derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-524 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-9494	Medium	5.9	3.9%	-	Fix
CVE-2021-24027	High	7.5	3.8%	-	Fix
CVE-2019-9495	Low	3.7	3.4%	-	Fix
CVE-2019-14997	Medium	4.3	1.2%	-	Fix
CVE-2024-0874	Medium	5.3	0.8%	-	Fix
CVE-2024-45596	High	7.4	0.7%	-	Fix

Common questions

How do I fix CVE-2026-44457?

Upgrade hono to 4.12.18 or later.

Is CVE-2026-44457 being actively exploited?

Not that we know of. CVE-2026-44457 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.20% is the estimated probability that it will be exploited in the next 30 days. That is higher than 10% of all scored CVEs.

How severe is CVE-2026-44457?

CVE-2026-44457 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-44457 affect?

Published advisories record a fix for hono (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-44457

Markdown

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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 2026-05-13.