How severe is CVE-2026-44457?

CVE-2026-44457 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-44457 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44457?

CVE-2026-44457 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44457?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44457 have an EU (EUVD) identifier?

Yes. CVE-2026-44457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30036.

When was CVE-2026-44457 published?

CVE-2026-44457 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-44457

CVE-2026-44457 is a medium-severity vulnerability in Hono with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-524.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30036
Weakness: CWE-524
Affected product: Hono
Published: 2026-05-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44457?: 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.
How severe is CVE-2026-44457?: CVE-2026-44457 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-44457 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44457?: CVE-2026-44457 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44457?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44457 have an EU (EUVD) identifier?: Yes. CVE-2026-44457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30036.
When was CVE-2026-44457 published?: CVE-2026-44457 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://github.com/honojs/hono/security/advisories/GHSA-p77w-8qqv-26rm

Affected products (1)

cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

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