CVE-2026-111127
catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string
catdoc catdoc
CVSS
6.9MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.13%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
Description
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.
Text from CVE List
Affected versions 1
- catdocaffected: all versions through 0.95CVE List
References 4
- vulncheck.com/advisories/catdoc-through-0.95-out-of-bounds-read-via-xls2csv-copy-unicode-stringAdvisoryvia CVE List
- hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-readReferencevia CVE List
- github.com/vbwagner/catdoc/blob/38a2807d22ce1a08bc39b94e9072a9f8f52cd86f/src/xlsparse.c#L421-L520Referencevia CVE List
- github.com/vbwagner/catdocReferencevia CVE List