6.9

CVE-2026-111127: catdoc Out-of-bounds Read

CVSS: 6.9v4.0MediumDeferred
AliasesDEBIAN-CVE-2026-111127UBUNTU-CVE-2026-111127
Published 15-10-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-111127 is a medium (CVSS 6.9) Out-of-bounds Read vulnerability in catdoc. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.13%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-10-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

16-10-202620-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Catdoc1 product
Debian1 product
  • catdocAll versions (No fix recorded)
Ubuntu1 product
  • catdocAll versions (No fix recorded)

3 vendors · 3 products

References

7 links