{"id":"CVE-2026-111678","kind":"vulnerability","aliases":["CVE-2026-111678"],"related":[],"title":"Antiword: crafted .doc file reads past stack buffer, crashing parser","description":"Antiword through 0.37 contains a stack out-of-bounds read vulnerability in vGet8PapInfo and vGet8ChrInfo in prop8.c because FKP run counts and grpprl offsets are not bounded. Attackers can supply a crafted .doc file with malicious FKP pages to read past the 512-byte stack buffer, crashing antiword or corrupting style parsing.","summary":"Antiword through 0.37 has a stack out-of-bounds read in the Word 8 property parsing code (vGet8PapInfo and vGet8ChrInfo in prop8.c) because FKP run counts and grpprl offsets are not bounded. An attacker who supplies a crafted .doc file can crash antiword or corrupt style parsing.","severity":"medium","cvss":4.8,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"antiword project antiword","fixed":[],"affected":"<= 0.37","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["antiword","document-conversion","linux","package"],"not_affected_if":["no-untrusted-doc-input"],"how_to_check":"- Run `antiword -v` or check the installed package version; affected releases are `0.37` and earlier.\n- unknown whether any other check applies.","fix":"- Move antiword to a release newer than `0.37` once a fixed version is published; the sources do not name one.\n- Until patched, do not run antiword on untrusted .doc files.","status":"open","published_at":"2026-10-16T18:17:50+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-25T04:33:37+00:00","updated_at":"2026-10-25T04:33:37+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:33:37Z","model":"claude-haiku-5-5","output":{"fix":"- Move antiword to a release newer than `0.37` once a fixed version is published; the sources do not name one.\n- Until patched, do not run antiword on untrusted .doc files.","reach":"local","title":"Antiword: crafted .doc file reads past stack buffer, crashing parser","impact":"low","summary":"Antiword through 0.37 has a stack out-of-bounds read in the Word 8 property parsing code (vGet8PapInfo and vGet8ChrInfo in prop8.c) because FKP run counts and grpprl offsets are not bounded. An attacker who supplies a crafted .doc file can crash antiword or corrupt style parsing.","category":"package","nicknames":[],"who_cares":["antiword","document-conversion","linux"],"confidence":0.6,"needs_auth":"no","worst_case":"Antiword crashes or corrupts style parsing on a crafted file","analyst_note":"Confirm the fixed version and whether the upstream project or distributions have shipped a patch, via https://nvd.nist.gov/vuln/detail/CVE-2026-111678.","how_to_check":"- Run `antiword -v` or check the installed package version; affected releases are `0.37` and earlier.\n- unknown whether any other check applies.","needs_analyst":true,"not_affected_if":["no-untrusted-doc-input"],"who_is_affected":"Teams that run antiword to convert Word .doc files, especially on a server or in a pipeline that processes uploads from outside. Systems that never open untrusted .doc files are unlikely to be exposed. unknown whether the sources list other exposed paths.","user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000634,"input_tokens":3399,"output_tokens":589,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-111678':13A,16A '-2026':12A,15A '0.37':28B,76C '512':117C '8':40B 'antiword':1A,17A,19A,20B,26B,69B,74C,122C 'attack':60B,102C 'bound':35B,58B,83C,101C 'buffer':8A,120C 'byte':118C 'code':43B 'contain':77C 'convers':23B 'corrupt':71B,124C 'count':52B,95C 'craft':2A,64B,106C 'crash':9A,68B,121C 'cve':11A,14A 'doc':3A,65B,107C 'document':22B 'document-convers':21B 'file':4A,66B,108C 'fkp':50B,93C,111C 'grpprl':54B,97C 'linux':24B 'malici':110C 'offset':55B,98C 'out-of-bound':32B,80C 'packag':25B 'page':112C 'pars':42B,73B,126C 'parser':10A 'past':6A,115C 'project':18A 'prop8.c':48B,91C 'properti':41B 'read':5A,36B,84C,114C 'run':51B,94C 'stack':7A,31B,79C,119C 'style':72B,125C 'suppli':62B,104C 'vget8chrinfo':46B,89C 'vget8papinfo':44B,87C 'vulner':85C 'word':39B","nicknames":[],"mitigations":[],"who_affected":"Teams that run antiword to convert Word .doc files, especially on a server or in a pipeline that processes uploads from outside. Systems that never open untrusted .doc files are unlikely to be exposed. unknown whether the sources list other exposed paths.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:17:50+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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-2026-111678","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111678","severity":null,"published_at":"2026-10-16T18:17:50+00:00","modified_at":"2026-10-23T15:17:24+00:00","first_seen_at":"2026-10-23T21:57:13+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"}