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CVE-2026-126210VulnerabilityPublished

@hono/node-server: Backslash

Affects @hono/node-serverSource GCVE Database

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Authoritative record:CVE-2026-126210· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium : upgrade to 2.1.6 when convenient.

Data as of 12 Nov 2026, 22:37 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.15.3
Patch
Available – fixed in 2.1.6, 1.19.18
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

Upgrade @hono/node-server to 2.1.6; @hono/node-server to 1.19.18.

Affected software

ProductAffectedFixed in
npm@hono/node-serverAffected
  • >=2.0.0 <2.1.6
Fixed in
  • 2.1.6
npm@hono/node-serverAffected
  • <1.19.18
Fixed in
  • 1.19.18

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade @hono/node-server to version 2.1.6 or later, or 1.19.18 or later, where the issue is fixed by rejecting requests containing raw backslashes in the path with a 400 Bad Request response. This prevents the bypass of path-based access controls by ensuring invalid request-targets are not processed.

Description

@hono/node-server improperly parses backslashes in request paths as path separators, allowing bypass of path-based access controls enforced by reverse proxies that do not normalize backslashes. This can cause requests intended to be blocked by a proxy to reach protected routes within the application.

References

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