Vulnerability · Published Apr 16, 2026 · Assigned by mitre
CVE-2026-41034
Medium 5.0
In plain English
A medium-severity out-of-bounds read in ONLYOFFICE DocumentServer from Ascensio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)5.0Medium
Exploit odds (30 days)0.3%top 77.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Ascensio | ONLYOFFICE DocumentServer | 0 – before 9.3.0 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N