Is there a public exploit for CVE-2025-71381?

No public exploit for CVE-2025-71381 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-2025-71381?

CVE-2025-71381 scores CVSS 6.9 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.29%.

What does CVE-2025-71381 affect?

CVE-2025-71381 affects Hono hono.

6.9 Medium

Hono before 4.10.3 contains a flaw in its CORS middleware: when the origin is not set to "", the middleware copies the Vary header from the…

CVE-2025-71381

Hono before 4.10.3 contains a flaw in its CORS middleware: when the origin is not set to "", the middleware copies the Vary header from the incoming request into the response. Because Vary is a response header that should be managed by the server, an attacker can supply arbitrary Vary values that are reflected into the response, potentially causing cache key pollution and inconsistent CORS enforcement in environments that rely on shared caches or proxies.

Assessment

CVSS: 6.9 (v4.0)
Severity: Medium
EPSS: 0.29% 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: 30 June 2026
Last updated: 29 October 2026
Affected: Hono · hono
Weakness: CWE-113
Assigner: disclosure@vulncheck.com

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

At the source

References

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