{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-4870: Qiskit SDK is vulnerable to specific functions may recurse too deeply and overflow the available stack space, when encountering certain classical expressions.","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-4870","status":"final","version":"1","initial_release_date":"2026-06-12T20:52:58.528Z","current_release_date":"2026-06-15T13:37:47.830Z","revision_history":[{"date":"2026-06-12T20:52:58.528Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"IBM Qiskit SDK 0.43.0 through 2.5.0 could allow an attacker to trigger a segmentation fault leading to a denial of service due to uncontrolled recursion in the parser.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-4870 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-4870"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-4870"},{"category":"external","summary":"ibm.com","url":"https://www.ibm.com/support/pages/node/7276123"}]},"product_tree":{"branches":[{"category":"vendor","name":"IBM","branches":[{"category":"product_name","name":"Qiskit SDK","branches":[{"category":"product_version_range","name":">=0.43.0 <=2.5.0","product":{"name":"IBM Qiskit SDK >=0.43.0 <=2.5.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:ibm:qiskit_sdk:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-4870","title":"Qiskit SDK is vulnerable to specific functions may recurse too deeply and overflow the available stack space, when encountering certain classical expressions.","notes":[{"category":"description","text":"IBM Qiskit SDK 0.43.0 through 2.5.0 could allow an attacker to trigger a segmentation fault leading to a denial of service due to uncontrolled recursion in the parser.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"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"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}