{"id":"CVE-2026-41509","summary":"Integer underflow in crypto_sign_open() leads to buffer overflow","details":"CROSS implementation contains reference and optimized implementations of the CROSS post-quantum signature algorithm. Prior to commit fc6b7e7, there is a buffer overflow in crypto_sign_open() caused by an underflow of the integer mlen. This issue has been patched via commit fc6b7e7.","aliases":["GHSA-w72c-hgx8-p7cv"],"modified":"2026-08-12T16:24:15.774483Z","published":"2026-05-08T13:47:17.770Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-121","CWE-122"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41509.json","unresolved_ranges":[{"extracted_events":[{"fixed":"fc6b7e78cdf789bb5c395a81dc601356f1383da0"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"ADVISORY","url":"https://github.com/CROSS-signature/CROSS-implementation/security/advisories/GHSA-w72c-hgx8-p7cv"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41509.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41509"},{"type":"FIX","url":"https://github.com/CROSS-signature/CROSS-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cross-signature/cross-implementation","events":[{"introduced":"0"},{"fixed":"fc6b7e78cdf789bb5c395a81dc601356f1383da0"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v2.2","v2.0","v1.2","v1.1","v1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41509.json","vanir_signatures_modified":"2026-08-12T16:24:15Z","vanir_signatures":[{"signature_type":"Function","signature_version":"v1","source":"https://github.com/cross-signature/cross-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0","target":{"file":"Reference_Implementation/lib/sign.c","function":"crypto_sign_open"},"deprecated":false,"digest":{"function_hash":"70770750323307666825992158497714364052","length":501},"id":"CVE-2026-41509-d144b327"},{"source":"https://github.com/cross-signature/cross-implementation/commit/fc6b7e78cdf789bb5c395a81dc601356f1383da0","target":{"file":"Reference_Implementation/lib/sign.c"},"deprecated":false,"digest":{"line_hashes":["7598353314488829133350743937367453244","195212271278767656618856783880887399843","242035960181669813962725551078743282154"],"threshold":0.9},"id":"CVE-2026-41509-ea2a24cb","signature_type":"Line","signature_version":"v1"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}]}