{"id":"CVE-2026-111127","title":"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","summary":"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 decl…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H","cwe":["CWE-125"],"vendor":"catdoc","product":"catdoc","affected":["catdoc <= 0.95"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:26.073","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-111127","references":[{"url":"https://github.com/vbwagner/catdoc","label":"disclosure@vulncheck.com"},{"url":"https://github.com/vbwagner/catdoc/blob/38a2807d22ce1a08bc39b94e9072a9f8f52cd86f/src/xlsparse.c#L421-L520","label":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-read","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/catdoc-through-0.95-out-of-bounds-read-via-xls2csv-copy-unicode-string","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-15T19:25:46.407Z","slug":"CVE-2026-111127","body":"## Overview\n\ncatdoc 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}