{"id":"CVE-2026-42444","summary":"NanaZip: Unbounded resource consumption in NanaZip littlefs parser via attacker-controlled BlockCount","details":"NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a denial-of-service vulnerability exists in the littlefs filesystem image parser in NanaZip. The handler's Open method reads BlockCount directly from the attacker-controlled superblock without any validation against the actual file size or any upper-bound ceiling, then iterates BlockCount times, allocating a file-path entry per iteration. A crafted 44-byte littlefs image with BlockCount = 0xFFFFFFFF causes ~4 billion heap allocations, exhausting available memory. This vulnerability is fixed in 6.0.1698.0.","aliases":["GHSA-7hqh-mq57-wjmq"],"modified":"2026-07-08T08:13:19.737486367Z","published":"2026-05-12T19:22:09.813Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42444.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42444.json"},{"type":"ADVISORY","url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-7hqh-mq57-wjmq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42444"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/m2team/nanazip","events":[{"introduced":"e4e8fbbc79db1280d94762c37e9037da169d76de"},{"fixed":"28b2bc47eaa37f56c670c72401d97fb1178e87b8"}],"database_specific":{"cpe":"cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"5.0.1250.0"},{"fixed":"6.0.1698.0"},{"introduced":"5.0.1252.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["6.0.1691.0","6.0.1650.0","6.0.1638.0","6.0.1632.0","6.0.1630.0","6.0.1621.0","6.0.1461.0","5.1.1263.0","5.0.1263.0","5.1.1252.0","5.0.1252.0","5.0.1250.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42444.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}]}