{"id":"CVE-2026-16599","summary":"Denial of Service in GNU wget","details":"GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation.\n\n\nThis issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa","modified":"2026-08-27T19:34:11.167290Z","published":"2026-08-25T14:17:04.941Z","database_specific":{"cna_assigner":"CERT-PL","cwe_ids":["CWE-606"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16599.json"},"references":[{"type":"ADVISORY","url":"https://cert.pl/en/posts/2026/08/CVE-2026-16599"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16599.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16599"},{"type":"FIX","url":"https://gitlab.com/gnuwget/wget/-/commit/e9697d98e7249b0f68a6be040a4f3dcc5bc101fa"},{"type":"PACKAGE","url":"https://gitlab.com/gnuwget/wget"},{"type":"PACKAGE","url":"https://gitlab.com/gnuwget/wget/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/gnuwget/wget","events":[{"introduced":"0"},{"fixed":"e9697d98e7249b0f68a6be040a4f3dcc5bc101fa"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.25.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.25.0","v1.24.5","v1.21.4","v1.21.3","v1.21.2","v1.21.1","v1.21","v1.20.3","v1.20.2","v1.20.1","v1.20","v1.19.5","v1.19.4","v1.19.3","v1.19.2","v1.19.1","v1.19","v1.18","v1.17.1","v1.17","v1.16.3","v1.16.2","v1.16.1","v1.16","v1.15","v1.14","v1.13.4","v1.13.3","v1.13.2","v1.13.1","v1.13","v1.12"],"database_specific":{"vanir_signatures_modified":"2026-08-27T19:34:11Z","vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"83629972154245979580097124321520827954","length":1392},"id":"CVE-2026-16599-3c99d0db","signature_type":"Function","signature_version":"v1","source":"https://gitlab.com/gnuwget/wget@e9697d98e7249b0f68a6be040a4f3dcc5bc101fa","target":{"file":"src/ftp-basic.c","function":"ftp_login"}},{"signature_type":"Line","signature_version":"v1","source":"https://gitlab.com/gnuwget/wget@e9697d98e7249b0f68a6be040a4f3dcc5bc101fa","target":{"file":"src/ftp-basic.c"},"deprecated":false,"digest":{"line_hashes":["31838835215719755823778801433726113013","145861084351290162579246764975654721175","203516910070714193558613116798012622202","61636936698075263436874688614656996076","158191985247817586319588247233069805760","334697050327844323255180009069964208281","172228886501923724478933628700867328999","243279731397249580702356342370902885608","128910329323558454640215098439223119818","159810301547358705014812671325287180810","271053972742448853802949794134404231674","241466927755026588576112322961754819515"],"threshold":0.9},"id":"CVE-2026-16599-d0336fb2"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16599.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}