{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74220","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-08-14T18:01:19.915Z","datePublished":"2026-09-29T21:29:22.617Z","dateUpdated":"2026-09-30T14:04:58.483Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-29T21:29:22.617Z"},"datePublic":"2026-08-19T00:00:00.000Z","title":"U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply","descriptions":[{"lang":"en","value":"U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Signed to Unsigned Conversion Error","cweId":"CWE-195","type":"CWE"}]}],"affected":[{"vendor":"u-boot","product":"u-boot","repo":"https://github.com/u-boot/u-boot","packageURL":"pkg:github/u-boot/u-boot","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"2026.10-rc5","status":"affected","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*","versionEndExcluding":"2026.10-rc5"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.8,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH"}}],"references":[{"url":"https://github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69a","tags":["patch"]},{"url":"https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L695","tags":["technical-description"]},{"url":"https://github.com/u-boot/u-boot","tags":["product"]},{"name":"VulnCheck Advisory: U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply"}],"credits":[{"lang":"en","value":"Shahriyar Jalayeri (ByteRay Ltd.)","type":"finder"},{"lang":"en","value":"Mehrun P. Hunter (ByteRay Ltd.)","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-30T14:04:49.999144Z","id":"CVE-2026-74220","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-30T14:04:58.483Z"}}]}}