CVE-2025-71381
Hono - Vary Header Injection in CORS Middleware
Description
Hono before 4.10.2 (fixed in 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.
INFO
Published Date :
June 30, 2026, 11:16 p.m.
Last Modified :
Oct. 12, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Hono to version 4.10.3 or later.
- Ensure CORS middleware configuration is secure.
- Remove or restrict custom Vary header handling.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-71381.
| URL | Resource |
|---|---|
| https://github.com/honojs/hono/security/advisories/GHSA-q7jf-gf43-6x6p | |
| https://www.vulncheck.com/advisories/hono-vary-header-injection-in-cors-middleware |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-71381 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-71381
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-71381 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-71381 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 12, 2026
Action Type Old Value New Value Changed Translation Title: Hono, Description: Hono anterior a 4.10.2 (corregido en 4.10.3) contiene una vulnerabilidad en su middleware CORS: cuando el origen no está configurado como '*', el middleware copia el encabezado Vary de la solicitud entrante a la respuesta. Debido a que Vary es un encabezado de respuesta que debería ser gestionado por el servidor, un atacante puede proporcionar valores Vary arbitrarios que se reflejan en la respuesta, lo que podría causar contaminación de la clave de caché y una aplicación inconsistente de CORS en entornos que dependen de cachés compartidas o proxies. Title: Hono, Description: Hono anterior a 4.10.2 (corregido en 4.10.3) contiene una vulnerabilidad en su middleware CORS: cuando el origen no está configurado como '*', el middleware copia el encabezado Vary de la solicitud entrante a la respuesta. Debido a que Vary es un encabezado de respuesta que debería ser gestionado por el servidor, un atacante puede proporcionar valores Vary arbitrarios que se reflejan en la respuesta, lo que podría causar contaminación de la clave de caché y una aplicación inconsistente de CORS en entornos que dependen de cachés compartidas o proxies. -
CVE Translated by [email protected]
Oct. 05, 2026
Action Type Old Value New Value Added Translation Title: Hono, Description: Hono anterior a 4.10.2 (corregido en 4.10.3) contiene una vulnerabilidad en su middleware CORS: cuando el origen no está configurado como '*', el middleware copia el encabezado Vary de la solicitud entrante a la respuesta. Debido a que Vary es un encabezado de respuesta que debería ser gestionado por el servidor, un atacante puede proporcionar valores Vary arbitrarios que se reflejan en la respuesta, lo que podría causar contaminación de la clave de caché y una aplicación inconsistente de CORS en entornos que dependen de cachés compartidas o proxies. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 01, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-71381', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-01T13:19:11.943471Z'} -
New CVE Received by [email protected]
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Hono', 'product': 'Hono', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '4.10.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '4.10.2', 'versionType': 'semver'}], 'packageURL': 'pkg:npm/hono', 'defaultStatus': 'unaffected'}] Added Description Hono before 4.10.2 (fixed in 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Added CWE CWE-113 Added Reference https://github.com/honojs/hono/security/advisories/GHSA-q7jf-gf43-6x6p Added Reference https://www.vulncheck.com/advisories/hono-vary-header-injection-in-cors-middleware