CVE-2026-110600 xlsxio through 0.2.37 NULL Pointer Dereference via Worksheet Relationship Without Id
Attackers can crash applications using xlsxio by providing crafted .xlsx files with missing relationship IDs, causing a null pointer dereference.
- 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-2026-110600?
CVE-2026-110600 is a medium-severity vulnerability in brechtsanders xlsxio, published on 14 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
xlsxio through 0.2.37 contains a NULL pointer dereference vulnerability in main_sheet_get_sheetfile_expat_callback_element_start() in lib/xlsxio_read.c that allows attackers to crash applications via crafted files. Attackers can supply a .xlsx file whose workbook.xml.rels contains a worksheet Relationship lacking an Id attribute, crashing the process when xlsxioread_sheet_open() is called.
Weakness: CWE-476
Which versions are affected by CVE-2026-110600?
How do I fix CVE-2026-110600?
No fix has been published for CVE-2026-110600 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-110600 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110600 exists.
Sources
Also known as GHSA-6j5v-fg26-wg57.