{"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":"2026-08-12T15:33:32.064242Z","published":"2026-03-30T21:42:27.798Z","related":["ALSA-2026:8457","ALSA-2026:8458","ALSA-2026:8945","SUSE-SU-2026:21436-1","SUSE-SU-2026:3562-1","openSUSE-SU-2026:10633-1","openSUSE-SU-2026:20657-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-190","CWE-252"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33983.json","unresolved_ranges":[{"extracted_events":[{"fixed":"3.24.2"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33983.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10709"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11332"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11333"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11336"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11649"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:11651"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:12359"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:12388"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19033"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19349"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8457"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8458"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8945"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:9656"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-33983"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33983.json"},{"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"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2453220"},{"type":"FIX","url":"https://github.com/FreeRDP/FreeRDP/commit/78188ab479c8e6eb9ba2475b3732c76b4bbe5425"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"0"},{"fixed":"78188ab479c8e6eb9ba2475b3732c76b4bbe5425"}],"database_specific":{"source":"REFERENCES"}}],"versions":["3.5.1","3.5.0","3.4.0","3.3.0","3.2.0","3.1.0","3.0.0","3.0.0-rc0","3.0.0-beta4","3.0.0-beta3","3.0.0-beta2","3.0.0-beta1","2.0.0","2.0.0-rc4","2.0.0-rc3","2.0.0-rc2","2.0.0-rc1","2.0.0-rc0","2.0.0-beta1+android11","2.0.0-beta1+android10","1.2.0-beta1+android9","1.2.0-beta1+android7","1.1.0-beta+2013071101","1.1.0-beta1+ios4","1.1.0-beta1+android5","1.1.0-beta1+android4","1.1.0-beta1+ios3","1.1.0-beta1+ios2","1.1.0-beta1+android3","1.1.0-beta1+android2","1.1.0-beta1+ios1","1.1.0-beta1","1.0.1","1.0.0","1.0-beta5","1.0-beta4","1.0-beta2","1.0-beta1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33983.json","vanir_signatures_modified":"2026-08-12T15:33:32Z","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["93353622505111390641882887844937277427","233908802214677999810634991854501629448","279142864844677305642716569359495253629","77569140509167542282398447243129113926","83612844996024105248664012484422011615","49781137138012574405199941494173475843","303170522966309767556167581485631193903","117674432803128929237739529249738416465","258303796643107187888805234840245563928","95195163942263249254929860241644909034","324452841881576761841371846305693526061","241555397306320874230176152574148632892","2140984073463181123878284469717546140","189480764641963025008645612231610617666","106305128971618163191092944166443280406","228520105562675674535300842835957570250","161063130164877359825491039384325625507","334297928795778675320517208706143758436","150500399394966192148632850450000736927","153678473575359258165617762855493813694","243477012013887053847528246786644999596","252698890282748040335583485150070376558","38545011161204013379981560391934922925"],"threshold":0.9},"id":"CVE-2026-33983-982c8937","signature_type":"Line","signature_version":"v1","source":"https://github.com/freerdp/freerdp/commit/78188ab479c8e6eb9ba2475b3732c76b4bbe5425","target":{"file":"libfreerdp/codec/progressive.c"}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}