What is CVE-2026-71849?

CVE-2026-71849 is a low-severity vulnerability in Honojs Hono, classified under Information Disclosure. CVSS score: 3.7/10. Published 2026-08-07.

How severe is CVE-2026-71849?

Low severity. CVSS v3 base score is 3.7 out of 10.

Information disclosure in Honojs Hono

CVE-2026-71849

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.7.0 to 4.12.33, the Proxy Helper proxy() function in hono/proxy does not remove response headers named by the origin's Connection header. Per RFC…

Vulnerability class: Information Disclosure

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Honojs Hono — versions >= 4.7.0, < 4.12.34

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-71849?: CVE-2026-71849 is a low-severity vulnerability in Honojs Hono, classified under Information Disclosure. CVSS score: 3.7/10. Published 2026-08-07.
How severe is CVE-2026-71849?: Low severity. CVSS v3 base score is 3.7 out of 10.