CVE-2026-41034 | Ascensio ONLYOFFICE DocumentServer up to 9.2.x XLS pictFmla.cbBufInCtlStm out-of-bounds

VDB-357900 · CVE-2026-41034 · GCVE-0-2026-41034 ASCENSIO ONLYOFFICE DOCUMENTSERVER UP TO 9.2.X XLS PICTFMLA.CBBUFINCTLSTM OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.5 $0-$5k 1.05+ Summaryinfo A vulnerability was found in Ascensio ONLYOFFICE DocumentServer up to 9.2.x and classified as problematic. This issue affects the function pictFmla.cbBufInCtlStm of the component XLS Handler. The manipulation results in out-of-bounds. This vulnerability is known as CVE-2026-41034. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component. Detailsinfo A vulnerability was found in Ascensio ONLYOFFICE DocumentServer up to 9.2.x. It has been classified as problematic. Affected is the function pictFmla.cbBufInCtlStm of the component XLS Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. CVE summarizes: 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. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-41034 since 04/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. Upgrading to version 9.3.0 eliminates this vulnerability. Productinfo Vendor Ascensio Name ONLYOFFICE DocumentServer Version 9.0 9.1 9.2 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.6 VulDB Meta Temp Score: 4.5 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.0 CNA Vector (MITRE): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds CWE: CWE-125 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: ONLYOFFICE DocumentServer 9.3.0 Timelineinfo 04/16/2026 Advisory disclosed 04/16/2026 +0 days CVE reserved 04/16/2026 +0 days VulDB entry created 04/16/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-41034 (🔒) GCVE (CVE): GCVE-0-2026-41034 GCVE (VulDB): GCVE-100-357900 Entryinfo Created: 04/16/2026 09:19 Changes: 04/16/2026 09:19 (65) Complete: 🔍 Cache ID: 99:E7D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸