CVE-2026-111127 catdoc through 0.95 Out-of-Bounds Read via xls2csv copy_unicode_string
Attackers can disclose memory or crash catdoc by providing a crafted .xls file with invalid character counts in specific records.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-111127?
CVE-2026-111127 is a medium-severity vulnerability in catdoc, published on 15 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-111127?
How do I fix CVE-2026-111127?
No fix has been published for CVE-2026-111127 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111127 being exploited?
There is no known exploitation of CVE-2026-111127 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-111127, GHSA-f7rh-84jf-2xrr, UBUNTU-CVE-2026-111127.