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TI-2026-74911 Aliases CVE-2026-111127

Out-of-bounds read in catdoc xls2csv lets attackers read memory

Priority LOW 29CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

catdoc through 0.95 contains an out-of-bounds read (CWE-125) in copy_unicode_string() in src/xlsparse.c, which trusts an unchecked string character count. If a user opens a crafted .xls file declaring 0xFFFF two-byte characters, a local attacker can disclose adjacent memory through xls2csv output or crash the process.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00127 2nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
catdoccatdocup to 0.95—No fix listedCNA
  • catdoc Vendorcatdoc Affected up to 0.95 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for catdoc.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111127
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 Affected versions changed · Red Hat
  4. 2026-10-16 CVSS score added · Red Hat
  5. 2026-10-16 CISA SSVC decision points changed

References

Other 3

  • TI-2024-36181 Integer underflow in catdoc CVSS 3.1HIGH 8.4
  • TI-2024-34920 Integer overflow in catdoc CVSS 3.1HIGH 8.4
  • TI-2026-74910 Out-of-bounds read in catdoc xls2csv MULRK record handler CVSS 4.0MEDIUM 6.9
  • TI-2003-00179 msxlsview.sh in xlsview for catdoc 0.91 and earlier allows local users to overwrite… CVSS 2.0LOW 2.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences