{"id":"CVE-2026-33983","summary":"FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS","details":"FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.","aliases":["GHSA-4gfm-4p52-h478"],"modified":"2026-04-21T10:59:13.716196880Z","published":"2026-03-30T21:42:27.798Z","related":["ALSA-2026:8457","ALSA-2026:8458","ALSA-2026:8945"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33983.json","cwe_ids":["CWE-190","CWE-252"],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33983.json"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/commit/78188ab479c8e6eb9ba2475b3732c76b4bbe5425"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33983"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"0"},{"fixed":"3028b706908f81767d9b9c744a90778c28f57d61"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"3.24.2"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33983.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}