GHSA-79qm-7rj5-m7r9

Suggest an improvement
Source
https://github.com/advisories/GHSA-79qm-7rj5-m7r9
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-79qm-7rj5-m7r9/GHSA-79qm-7rj5-m7r9.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-79qm-7rj5-m7r9
Aliases
Downstream
CGA (89)
MINI (9)
Published
2026-08-07T18:38:48Z
Modified
2026-08-07T18:56:13Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Hono: Proxy Helper does not remove response headers listed in the `Connection` header
Details

Summary

The Proxy Helper (hono/proxy) does not remove response headers named by the origin's Connection header. Headers that the origin marked as connection-scoped are therefore forwarded to clients.

Details

Per RFC 9110 Section 7.6.1, an intermediary must remove the header fields listed in a message's Connection header field before forwarding the message, in addition to the well-known hop-by-hop headers. The proxy() function removed the well-known hop-by-hop headers (including Connection itself) from origin responses, but did not remove the headers that the response's Connection header field designated as connection-scoped.

This issue arises when an application proxies responses from an origin that declares additional, non-standard headers as hop-by-hop via the Connection response header.

Impact

A client may receive response headers that the origin intended only for its immediate peer. This may lead to:

  • Disclosure of connection-scoped or internal metadata contained in such headers

This issue affects applications that use the Proxy Helper (hono/proxy) to forward responses from origins that list custom header names in their Connection response header. Applications whose origins only use the standard hop-by-hop headers are not affected.

Database specific 
{
    "cwe_ids": [
        "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-07T18:38:48Z",
    "nvd_published_at": null,
    "severity": "LOW"
}
References

Affected packages

npm / hono

Package

Name
hono
View open source insights on deps.dev
Purl
pkg:npm/hono

Affected ranges

Type
SEMVER
Events
Introduced
4.7.0
Fixed
4.12.34

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-79qm-7rj5-m7r9/GHSA-79qm-7rj5-m7r9.json"