CVE-2026-34475

import requests def check_poc(target_url): """ Conceptual PoC for CVE-2026-34475. Attempts to trigger cache poisoning via root path manipulation. """ headers = { "User-Agent": "CVE-2026-34475-Test", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" } # Attack vector: Sending crafted request to root path with potential HTTP/1.1 specifics try: response = requests.get(target_url, headers=headers, timeout=10) if response.status_code == 200: print(f"[+] Request sent to {target_url}. Check cache behavior manually.") # In a real exploit, one would check if the response reflects malicious input # or if authentication headers were bypassed. else: print(f"[-] Server returned status code: {response.status_code}") except Exception as e: print(f"[!] Error: {e}") if __name__ == "__main__": target = "http://example.com/" # Replace with target URL check_poc(target)

{"cve": {"id": "CVE-2026-34475", "sourceIdentifier": "[email protected]", "published": "2026-03-27T20:16:36.390", "lastModified": "2026-04-22T19:40:02.797", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 2.7}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-180"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:*:*:*:*:*:*:*:*", "versionEndIncluding": "6.0.15", "matchCriteriaId": "E53A64C0-FC22-40B5-8C3B-6288B44AC3FC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r1:*:*:*:*:*:*", "matchCriteriaId": "F24D68B5-362E-4797-B6DE-C19A2893186C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r10:*:*:*:*:*:*", "matchCriteriaId": "910BAD01-26E5-4D12-AA23-0BD2D48F229C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r11:*:*:*:*:*:*", "matchCriteriaId": "BCF39307-6F25-4D97-8901-EE1A80A66AD9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r2:*:*:*:*:*:*", "matchCriteriaId": "05E529DF-DEE1-4A62-998B-CA312DF888FD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r3:*:*:*:*:*:*", "matchCriteriaId": "8AB27B34-2951-4755-851C-7C942DAFB6C7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r4:*:*:*:*:*:*", "matchCriteriaId": "18A22D42-B038-4E09-92DD-8AFD2F51A340"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r5:*:*:*:*:*:*", "matchCriteriaId": "FE76D616-3AA8-4D9A-9D41-9AE35FE20DBC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r6:*:*:*:*:*:*", "matchCriteriaId": "9C5610CF-1FE4-4DF8-8D49-7C0CCF0359E4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r7:*:*:*:*:*:*", "matchCriteriaId": "27B776B2-9C38-45BE-89E4-ECDEEAE538A9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r8:*:*:*:*:*:*", "matchCriteriaId": "ED3CA600-C88D-4825-8C36-E052822AF59F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r9:*:*:*:*:*:*", "matchCriteriaId": "6B1D57B1-9771-4195-9EE3-B26EA776FB6B"}]}]}, {"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:vinyl-cache:vinyl_cache:*:*:*:*:*:*:*:*", "versionEndExcluding": "8.0.1", "matchCriteriaId": "3C1ED7AA-6E2F-4C75-82D3-D7C2CB125C48"}]}]}], "references": [{"url": "https://vinyl-cache.org/security/VSV00018.html", "source": "[email protected]", "tags": ["Vendor Advisory", "Mitigation"]}]}}