CVE-2026-41034 PUBLISHED

Assigner: mitre
Reserved: 16.04.2026 Published: 16.04.2026 Updated: 16.04.2026

ONLYOFFICE DocumentServer before 9.3.0 has an untrusted pointer dereference in XLS processing/conversion (via pictFmla.cbBufInCtlStm and other vectors), leading to an information leak and ASLR bypass.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CVSS Score: 5

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Ascensio
Product	ONLYOFFICE DocumentServer
Versions	Default: unaffected affected from 0 to 9.3.0 (excl.)

References

https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md

Problem Types

CWE-125 Out-of-bounds Read CWE