{"id":"CVE-2026-111127","summary":"catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string","details":"catdoc through 0.95 contains an out-of-bounds read vulnerability in copy_unicode_string() in src/xlsparse.c that allows attackers to read past buffers via an unchecked string character count. Attackers can supply a crafted .xls file declaring 0xFFFF two-byte characters in LABEL, STRING, or SST records to disclose adjacent memory through xls2csv output or crash the process.","modified":"2026-10-17T02:46:09.223155133Z","published":"2026-10-15T18:57:23.479Z","database_specific":{"cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111127.json","cna_assigner":"VulnCheck"},"references":[{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111127.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111127"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/catdoc-through-0.95-out-of-bounds-read-via-xls2csv-copy-unicode-string"},{"type":"PACKAGE","url":"https://github.com/vbwagner/catdoc"},{"type":"ARTICLE","url":"https://github.com/vbwagner/catdoc/blob/38a2807d22ce1a08bc39b94e9072a9f8f52cd86f/src/xlsparse.c#L421-L520"},{"type":"ARTICLE","url":"https://hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-read"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/vbwagner/catdoc","events":[{"introduced":"0"},{"fixed":"38a2807d22ce1a08bc39b94e9072a9f8f52cd86f"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"0"},{"last_affected":"0.95"},{"fixed":"0.95"}]}}],"versions":["REL_0_94_2","fromlynx","REL_0_94_1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111127.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"}]}