CVE-2026-111127CWE-125

CVE-2026-111127

Medium · published October 15, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
2.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
CVSS v4.0
6.9 · 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
EPSS
0.00129 · 2.3th percentile
Weakness
CWE-125 · Out-of-bounds Read
Published
2026-10-15T23:17Z
References (4)
https://github.com/vbwagner/catdoc · [email protected]https://github.com/vbwagner/catdoc/blob/38a2807d22ce1a08bc39b94e9072a9f8f52cd86f/src/xlsparse.c#L421-L520 · [email protected]https://hackmd.io/@haind-pwn/catdoc-xls-mulrk-endcol-and-string-count-oob-read · [email protected]https://www.vulncheck.com/advisories/catdoc-through-0.95-out-of-bounds-read-via-xls2csv-copy-unicode-string · [email protected]
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 15 OCT 18:57Z
    catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string
    cvelistv5
  • 15 OCT 18:57Z
    catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string
    cvelistv5