Is there a public exploit for CVE-2026-126358?

No public exploit for CVE-2026-126358 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-126358?

CVE-2026-126358 scores CVSS 5.3 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.00347%.

What does CVE-2026-126358 affect?

CVE-2026-126358 affects honojs hono.

5.3 Medium

Hono: RegExpRouter skips wildcard middleware for some route sets and for paths with an encoded line terminator

CVE-2026-126358

Summary RegExpRouter, which the default SmartRouter selects for most applications, skipped wildcard middleware in three cases, so a route handler ran without the middleware registered for it: 1. Middleware whose parameter is written with the explicit default pattern, such as /api/:tenant{[^/]+}/admin/, was not applied to a route written as /api/:tenant/admin/:id. (since 4.13.0) 2. Middleware on /admin/ was not applied to a route registered on /admin for paths under /admin/. (since 4.1.4) 3. For a path with an encoded line terminator (%0A, %0D, %E2%80%A8, %E2%80%A9), no wildcard pattern matched, so the request reached the not-found handler without any wildcard middleware. (since 4.4.0) TrieRouter, LinearRouter and PatternRouter apply the middleware in all three cases. Details RegExpRouter decides at registration time which wildcard middleware covers which route. In cases 1 and 2 it treated patterns that match the same requests as different ones. In case 3 the compiled wildcard did not match line terminators. The fix derives the coverage from the structure of the registered paths and lets wildcards match line terminators. It also corrects other differences from the other routers (a…

Assessment

CVSS: 5.3 (v3.1)
Severity: Medium
EPSS: 0.00347% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 12 November 2026
Last updated: 13 November 2026
Affected: honojs · hono · hono
Weakness: CWE-863
Assigner: GitHub_M

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

At the source

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