{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12413", "assignerOrgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df", "state": "PUBLISHED", "assignerShortName": "libreswan", "dateReserved": "2026-06-16T15:52:12.674Z", "datePublished": "2026-07-02T21:19:22.177Z", "dateUpdated": "2026-07-02T21:19:22.177Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "d42dc95b-23f1-4e06-9076-20753a0fb0df", "shortName": "libreswan", "dateUpdated": "2026-07-02T21:19:22.177Z"}, "title": "IKEv2 Denial of Service via malformed fragmentation", "descriptions": [{"lang": "en", "value": "An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected."}], "affected": [{"vendor": "The Libreswan Project", "product": "libreswan", "versions": [{"version": "4.6", "status": "affected", "lessThanOrEqual": "5.3", "versionType": "semver"}, {"version": "5.3.1", "status": "unaffected", "versionType": "semver"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-193", "description": "Off-by-one Error"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-617", "description": "Reachable Assertion"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"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"}}, {"other": {"type": "vendorSeverity", "content": {"value": "MEDIUM", "description": "Vendor-assessed severity. The daemon automatically restarts after the crash, requiring continued exploitation for sustained denial of service."}}}], "workarounds": [{"lang": "en", "value": "If fragmentation is not needed, fragmentation=no can be added to all IKEv2 configurations. If fragmentation is needed, no workaround is possible and the fix needs to be applied."}], "solutions": [{"lang": "en", "value": "Upgrade to libreswan 5.3.1 or later. Patches for libreswan 4.15 and 5.3 are available at https://libreswan.org"}], "credits": [{"lang": "en", "type": "finder", "value": "Hu Xinyao"}], "references": [{"name": "Libreswan Security Advisory", "url": "https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt"}, {"name": "Libreswan CVE-2026-12413 Patches", "url": "https://libreswan.org/security/CVE-2026-12413/"}], "timeline": [{"time": "2026-06-16T00:00:00.000Z", "lang": "en", "value": "Libreswan notified of the issue via [email protected]"}, {"time": "2026-06-16T00:00:00.000Z", "lang": "en", "value": "Advanced notice given to supported customers and distributions"}, {"time": "2026-06-24T00:00:00.000Z", "lang": "en", "value": "Public announcement and release of libreswan 5.3.1"}], "x_generator": {"engine": "cvelib 1.8.0"}}}}

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