{"id":"CVE-2026-84851","state":"PUBLISHED","title":"Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6","description":"An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service.","publishedAt":"2026-09-02T20:19:55.616Z","updatedAt":"2026-09-03T13:15:45.459Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"AMZN"},"assigner":"AMZN","products":["Amazon ion-c"],"affected":[{"vendor":"Amazon","product":"ion-c","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.1.6","versionType":"custom"}]}],"references":["https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6","https://aws.amazon.com/security/security-bulletins/2026-094-aws/","https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44"],"weaknesses":["CWE-674"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/84xxx/CVE-2026-84851.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84851","state":"PUBLISHED","datePublished":"2026-09-02T20:19:55.616Z","dateUpdated":"2026-09-03T13:15:45.459Z","assignerShortName":"AMZN","assignerOrgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","dateReserved":"2026-09-02T13:01:03.758Z"},"containers":{"cna":{"title":"Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6","descriptions":[{"lang":"en","value":"An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service."}],"affected":[{"vendor":"Amazon","product":"ion-c","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.1.6","versionType":"custom"}]}],"references":[{"url":"https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6","tags":["release-notes","patch"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-094-aws/","tags":["vendor-advisory"]},{"url":"https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-674","lang":"en","description":"CWE-674: Uncontrolled Recursion","type":"CWE"}]}],"providerMetadata":{"shortName":"AMZN","orgId":"ff89ba41-3aa1-4d27-914a-91399e9639e5","dateUpdated":"2026-09-02T20:22:33.566Z"},"impacts":[{"capecId":"CAPEC-230","descriptions":[{"lang":"en","value":"CAPEC-230 Serialized Data with Nested Payloads"}]}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:amazon:ion-c:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndExcluding":"1.1.6"}]}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-03T13:15:17.362137Z","id":"CVE-2026-84851","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-03T13:15:45.459Z"}}]}}}