What is CVE-2026-44457?

CVE-2026-44457 is a medium-severity vulnerability in Hono, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-05-13.

How severe is CVE-2026-44457?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Hono

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.

Published 2026-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (24.5th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Hono
Honojs Hono — versions < 4.12.18

Weakness classification (CWE)

CWE-524 — Use of Cache Containing Sensitive Information

References

github.com/honojs/hono/security/advisories/GHSA-p77w-8qqv-26rm (Vendor Advisory)

Frequently asked questions

What is CVE-2026-44457?: CVE-2026-44457 is a medium-severity vulnerability in Hono, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-05-13.
How severe is CVE-2026-44457?: Medium severity. CVSS v3 base score is 5.3 out of 10.