CVE-2026-119776

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-119776", "assignerOrgId": "57a55968-44ac-464c-a794-6ba3baad09c4", "state": "PUBLISHED", "assignerShortName": "NetDEF", "dateReserved": "2026-10-30T16:14:17.897Z", "datePublished": "2026-11-04T14:15:32.391Z", "dateUpdated": "2026-11-09T21:11:30.420Z"}, "containers": {"cna": {"affected": [{"vendor": "frrouting", "product": "frrouting", "repo": "https://github.com/FRRouting/frr/", "modules": ["ospf6d"], "programFiles": ["ospf6d/ospf6_message.c"], "versions": [{"status": "affected", "version": "0", "lessThan": "*", "changes": [{"at": "eaccfcdb35bce8d94621b06633417ba3fa657f34", "status": "unaffected"}], "versionType": "git"}], "defaultStatus": "affected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*"}]}]}], "title": "frr: ospf6d fails to enforce all OSPFv3 packets use IPv6 link-local addresses", "descriptions": [{"lang": "en", "value": "In all prior released versions of FRRouting, the OSPFv3 (for IPv6) implementation does not check that OSPFv3 packets have a link-local source address and either a link-local destination or one of the protocol multicast destination groups. This may enable malicious actors to establish OSPFv3 adjacencies from unexpectedly, distant IPv6 hosts. Proper usage of OSPFv3 authentication trailers (RFC 7166, as is best practice) prevents full exploitation of this issue, though may allow a malicious actor to waste CPU on authentication checks.\n\n\nNote the linked PR #23935 is not sufficient to fix the issue as it only verifies the source address. It is the destination address that must be checked.\n\n\nRequired configuration: The OSPFv3 for IPv6 routing protocol must be running (ospf6d process) and in use (enabled globally with\u00a0\"router ospf6\" and on specific interfaces with \"ipv6 ospf6 area\".)\n\n\nWorkaround: either:\n\n * configure OSPFv3 authentication trailers (\"ipv6 ospf6 authentication\")\n * or ensure through firewall configuration that only packets with link-local or multicast destination addresses are accepted on input for IPv6 protocol 89 (OSPF). Note that checking the source address is insufficient, as some routers may (unexpectedly) forward packets with global-scoped IPv6 destination addresses even if they have link-local source addresses."}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-304", "description": "CWE-304 Missing critical step in authentication: protocol interactions should be limited to IPv6 link-local scope", "type": "CWE"}]}], "references": [{"url": "https://github.com/FRRouting/frr/pull/24183/changes/eaccfcdb35bce8d94621b06633417ba3fa657f34", "tags": ["patch"]}, {"url": "https://github.com/FRRouting/frr/pull/24183", "tags": ["related"]}, {"url": "https://github.com/FRRouting/frr/pull/23935", "tags": ["related"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "YES", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.1, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/AU:Y"}}], "credits": [{"lang": "en", "value": "Bing Shui <bingshui@smail.nju.edu.cn> (not reported as security issue)", "type": "reporter"}, {"lang": "en", "value": "Anthropic OSS-scanner (re-report, ANT-2026-N0E1INIV)", "type": "tool"}], "workarounds": [{"lang": "en", "value": "Either:\n\n * configure OSPFv3 authentication trailers (\"ipv6 ospf6 authentication\")\n * or ensure through firewall configuration that only packets with link-local or multicast destination addresses are accepted on input for IPv6 protocol 89 (OSPF). Note that checking the source address is insufficient, as some routers may (unexpectedly) forward packets with global-scoped IPv6 destination addresses even if they have link-local source addresses."}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "vim"}, "providerMetadata": {"orgId": "57a55968-44ac-464c-a794-6ba3baad09c4", "shortName": "NetDEF", "dateUpdated": "2026-11-04T16:53:47.660Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-09T21:10:58.734852Z", "id": "CVE-2026-119776", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-09T21:11:30.420Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-119776", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-11-09T21:10:58.734852Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-09T21:11:25.323Z"}}], "cna": {"title": "frr: ospf6d fails to enforce all OSPFv3 packets use IPv6 link-local addresses", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "reporter", "value": "Bing Shui <bingshui@smail.nju.edu.cn> (not reported as security issue)"}, {"lang": "en", "type": "tool", "value": "Anthropic OSS-scanner (re-report, ANT-2026-N0E1INIV)"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.1, "Automatable": "YES", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/AU:Y", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/FRRouting/frr/", "vendor": "frrouting", "modules": ["ospf6d"], "product": "frrouting", "versions": [{"status": "affected", "changes": [{"at": "eaccfcdb35bce8d94621b06633417ba3fa657f34", "status": "unaffected"}], "version": "0", "lessThan": "*", "versionType": "git"}], "programFiles": ["ospf6d/ospf6_message.c"], "defaultStatus": "affected"}], "references": [{"url": "https://github.com/FRRouting/frr/pull/24183/changes/eaccfcdb35bce8d94621b06633417ba3fa657f34", "tags": ["patch"]}, {"url": "https://github.com/FRRouting/frr/pull/24183", "tags": ["related"]}, {"url": "https://github.com/FRRouting/frr/pull/23935", "tags": ["related"]}], "workarounds": [{"lang": "en", "value": "Either:\n\n * configure OSPFv3 authentication trailers (\"ipv6 ospf6 authentication\")\n * or ensure through firewall configuration that only packets with link-local or multicast destination addresses are accepted on input for IPv6 protocol 89 (OSPF). Note that checking the source address is insufficient, as some routers may (unexpectedly) forward packets with global-scoped IPv6 destination addresses even if they have link-local source addresses."}], "x_generator": {"engine": "vim"}, "descriptions": [{"lang": "en", "value": "In all prior released versions of FRRouting, the OSPFv3 (for IPv6) implementation does not check that OSPFv3 packets have a link-local source address and either a link-local destination or one of the protocol multicast destination groups. This may enable malicious actors to establish OSPFv3 adjacencies from unexpectedly, distant IPv6 hosts. Proper usage of OSPFv3 authentication trailers (RFC 7166, as is best practice) prevents full exploitation of this issue, though may allow a malicious actor to waste CPU on authentication checks.\n\n\nNote the linked PR #23935 is not sufficient to fix the issue as it only verifies the source address. It is the destination address that must be checked.\n\n\nRequired configuration: The OSPFv3 for IPv6 routing protocol must be running (ospf6d process) and in use (enabled globally with\u00a0\"router ospf6\" and on specific interfaces with \"ipv6 ospf6 area\".)\n\n\nWorkaround: either:\n\n * configure OSPFv3 authentication trailers (\"ipv6 ospf6 authentication\")\n * or ensure through firewall configuration that only packets with link-local or multicast destination addresses are accepted on input for IPv6 protocol 89 (OSPF). Note that checking the source address is insufficient, as some routers may (unexpectedly) forward packets with global-scoped IPv6 destination addresses even if they have link-local source addresses."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-304", "description": "CWE-304 Missing critical step in authentication: protocol interactions should be limited to IPv6 link-local scope"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*", "vulnerable": true}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "57a55968-44ac-464c-a794-6ba3baad09c4", "shortName": "NetDEF", "dateUpdated": "2026-11-04T16:53:47.660Z"}}}, "cveMetadata": {"cveId": "CVE-2026-119776", "state": "PUBLISHED", "dateUpdated": "2026-11-09T21:11:30.420Z", "dateReserved": "2026-10-30T16:14:17.897Z", "assignerOrgId": "57a55968-44ac-464c-a794-6ba3baad09c4", "datePublished": "2026-11-04T14:15:32.391Z", "assignerShortName": "NetDEF"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "affected", "modules": ["ospf6d"], "product": "frrouting", "programFiles": ["ospf6d/ospf6_message.c"], "repo": "https://github.com/FRRouting/frr/", "vendor": "frrouting", "versions": [{"changes": [{"at": "eaccfcdb35bce8d94621b06633417ba3fa657f34", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "0", "versionType": "git"}]}], "source": "57a55968-44ac-464c-a794-6ba3baad09c4"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In all prior released versions of FRRouting, the OSPFv3 (for IPv6) implementation does not check that OSPFv3 packets have a link-local source address and either a link-local destination or one of the protocol multicast destination groups. This may enable malicious actors to establish OSPFv3 adjacencies from unexpectedly, distant IPv6 hosts. Proper usage of OSPFv3 authentication trailers (RFC 7166, as is best practice) prevents full exploitation of this issue, though may allow a malicious actor to waste CPU on authentication checks.\n\n\nNote the linked PR #23935 is not sufficient to fix the issue as it only verifies the source address. It is the destination address that must be checked.\n\n\nRequired configuration: The OSPFv3 for IPv6 routing protocol must be running (ospf6d process) and in use (enabled globally with\u00a0\"router ospf6\" and on specific interfaces with \"ipv6 ospf6 area\".)\n\n\nWorkaround: either:\n\n * configure OSPFv3 authentication trailers (\"ipv6 ospf6 authentication\")\n * or ensure through firewall configuration that only packets with link-local or multicast destination addresses are accepted on input for IPv6 protocol 89 (OSPF). Note that checking the source address is insufficient, as some routers may (unexpectedly) forward packets with global-scoped IPv6 destination addresses even if they have link-local source addresses."}], "id": "CVE-2026-119776", "lastModified": "2026-11-12T22:11:01.153", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/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:Y/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "57a55968-44ac-464c-a794-6ba3baad09c4", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-119776", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-11-09T21:10:58.734852Z", "version": "2.0.3"}}]}, "published": "2026-11-04T15:17:41.400", "references": [{"source": "57a55968-44ac-464c-a794-6ba3baad09c4", "url": "https://github.com/FRRouting/frr/pull/23935"}, {"source": "57a55968-44ac-464c-a794-6ba3baad09c4", "url": "https://github.com/FRRouting/frr/pull/24183"}, {"source": "57a55968-44ac-464c-a794-6ba3baad09c4", "url": "https://github.com/FRRouting/frr/pull/24183/changes/eaccfcdb35bce8d94621b06633417ba3fa657f34"}], "sourceIdentifier": "57a55968-44ac-464c-a794-6ba3baad09c4", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-304"}], "source": "57a55968-44ac-464c-a794-6ba3baad09c4", "type": "Secondary"}]}

{"bugzilla": {"description": "frr: frr: Unauthorized routing adjacency establishment via missing OSPFv3 address validation", "id": "2566943", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566943"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H", "status": "draft"}, "cwe": "CWE-940", "details": ["A flaw was found in FRRouting. The Open Shortest Path First version 3 (OSPFv3) implementation does not validate that incoming network packets originate from and are destined for expected local network addresses. A remote attacker can exploit this flaw by sending specially crafted packets from a distant network to establish unauthorized routing adjacencies. Successful exploitation may allow the attacker to manipulate network routing or cause a Denial of Service (DoS) by exhausting system resources."], "name": "CVE-2026-119776", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10::fastdatapath", "fix_state": "Affected", "package_name": "frr", "product_name": "Fast Datapath for RHEL 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Affected", "package_name": "frr", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "frr", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "frr", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "frr", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "frr10", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-11-04T14:15:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-119776\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-119776\nhttps://github.com/FRRouting/frr/pull/23935"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "frrouting", "source": "cna", "vendor": "frrouting"}, "product": "frrouting", "vendor": "frrouting"}], "created": "2026-11-04T15:45:14.693300+00:00", "updated": "2026-11-05T03:00:16.965489+00:00", "vendors": ["frrouting", "frrouting$PRODUCT$frrouting"]}