{"id":"CVE-2026-111881","kind":"vulnerability","aliases":["CVE-2026-111881"],"related":[],"title":"FreeRDP: crafted clipboard BMP causes crash or out-of-bounds write","description":"FreeRDP from 3.14.1 before 3.32.0 contains an integer underflow in the WinPR BMP writer, where a mismatched stride calculation passes SIZE_MAX - 3 to Stream_Zero for sub-byte images. A malicious RDP clipboard peer can return a crafted 1-bpp BMP processed by clipboard_synthesize_image_format_to_bmp for CF_DIB/CF_DIBV5, crashing the client or causing an out-of-bounds write.","summary":"FreeRDP's WinPR BMP writer miscalculates buffer size for 1-bit-per-pixel images, causing an integer underflow. A malicious RDP server acting as clipboard peer can send a crafted image that crashes the client or writes out of bounds.","severity":"high","cvss":7.6,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","linux-desktops","package","rdp-clients","remmina"],"not_affected_if":["clipboard-redirection-disabled","fixed-version","trusted-servers-only"],"how_to_check":"- Run `xfreerdp --version` or check the installed FreeRDP package version\n- Confirm whether clipboard redirection is enabled in client sessions","fix":"- Upgrade FreeRDP to `3.32.0` or later\n- Until upgraded, disable clipboard redirection in RDP sessions","status":"open","published_at":"2026-10-17T19:16:29+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","triaged_at":"2026-10-25T03:14:37+00:00","updated_at":"2026-10-25T03:14:37+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T03:14:37Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade FreeRDP to `3.32.0` or later\n- Until upgraded, disable clipboard redirection in RDP sessions","reach":"network","title":"FreeRDP: crafted clipboard BMP causes crash or out-of-bounds write","impact":"medium","summary":"FreeRDP's WinPR BMP writer miscalculates buffer size for 1-bit-per-pixel images, causing an integer underflow. A malicious RDP server acting as clipboard peer can send a crafted image that crashes the client or writes out of bounds.","category":"package","nicknames":[],"who_cares":["freerdp","rdp-clients","linux-desktops","remmina"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Client crashes or attacker writes out of bounds in memory","analyst_note":"Confirm the exact clipboard trigger conditions and whether out-of-bounds write yields code execution; check the FreeRDP advisory linked from NVD.","how_to_check":"- Run `xfreerdp --version` or check the installed FreeRDP package version\n- Confirm whether clipboard redirection is enabled in client sessions","needs_analyst":true,"not_affected_if":["fixed-version","clipboard-redirection-disabled","trusted-servers-only"],"who_is_affected":"Users of FreeRDP clients from `3.14.1` up to but not including `3.32.0` who connect to RDP servers they do not fully trust, with clipboard redirection active. Servers you control or fully trust are a lower risk. Systems on fixed versions can skip this.","user_interaction":"unknown","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000633,"input_tokens":3398,"output_tokens":586,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-111881':15A,18A '-2026':14A,17A '1':37B,109C '3':91C '3.14.1':71C '3.32.0':73C 'act':51B 'bit':39B 'bit-per-pixel':38B 'bmp':4A,31B,81C,111C,119C 'bound':11A,68B,132C 'bpp':110C 'buffer':34B 'byte':98C 'calcul':87C 'caus':5A,43B,127C 'cf':121C 'client':26B,63B,125C 'clipboard':3A,53B,103C,114C 'contain':74C 'craft':2A,58B,108C 'crash':6A,61B,123C 'cve':13A,16A 'desktop':22B 'dib/cf_dibv5':122C 'format':117C 'freerdp':1A,19B,28B,69C 'imag':42B,59B,99C,116C 'integ':45B,76C 'linux':21B 'linux-desktop':20B 'malici':48B,101C 'max':90C 'miscalcul':33B 'mismatch':85C 'out-of-bound':8A,129C 'packag':23B 'pass':88C 'peer':54B,104C 'per':40B 'pixel':41B 'process':112C 'rdp':25B,49B,102C 'rdp-client':24B 'remmina':27B 'return':106C 'send':56B 'server':50B 'size':35B,89C 'stream':93C 'stride':86C 'sub':97C 'sub-byt':96C 'synthes':115C 'underflow':46B,77C 'winpr':30B,80C 'write':12A,65B,133C 'writer':32B,82C 'zero':94C","nicknames":[],"mitigations":[],"who_affected":"Users of FreeRDP clients from `3.14.1` up to but not including `3.32.0` who connect to RDP servers they do not fully trust, with clipboard redirection active. Servers you control or fully trust are a lower risk. Systems on fixed versions can skip this.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-17T19:16:29+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111881","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111881","severity":null,"published_at":"2026-10-17T19:16:29+00:00","modified_at":"2026-10-19T22:17:04+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}