EUVD-2026-36740
GHSA-gpc5-jgqj-xp2q
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
File must be opened locally (AV:L), user interaction is required to open the document (UI:R), no attacker privileges needed (PR:N), scope unchanged, availability impact is high with limited memory-leak or write primitives confirmed (C:L/I:L).
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Primary rating from Vendor (Document Fdn.).
CVSS VectorVendor: Document Fdn.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
LibreOffice Calc can import tracked changes from a spreadsheet document. A heap buffer overflow existed when a document reused the same change identifier for two different kinds of change. The importer then treated one change object as a different, larger type and wrote past the end of its allocation. In fixed versions records with a duplicate identifier are rejected.
AnalysisAI
Heap buffer overflow in LibreOffice Calc's tracked-changes importer allows an attacker who delivers a maliciously crafted spreadsheet to corrupt heap memory, causing high-impact availability loss and potentially enabling arbitrary code execution at the victim's privilege level. The vulnerability is triggered when a document reuses the same change identifier for two structurally different change types, causing the importer to misidentify object size and write past the allocation boundary. A proof-of-concept exists (CVSS 4.0 E:P modifier); no confirmed active exploitation (CISA KEV) has been recorded at time of analysis.
Technical ContextAI
LibreOffice Calc, developed by The Document Foundation (CPE: cpe:2.3:a:the_document_foundation:libreoffice:*:*:*:*:*:*:*:*), implements a tracked-changes import subsystem that parses and reconstructs collaborative edit history from spreadsheet files. The root cause is CWE-843 (Access of Resource Using Incompatible Type, commonly called type confusion): the importer uses the change identifier as a key to look up or dispatch change objects, but when a document presents the same identifier for two different change kinds, the importer resolves the object as the wrong type - one that is structurally larger - and proceeds to write fields into memory beyond the actual allocation boundary. This constitutes a classic heap buffer overflow driven by type confusion, a particularly dangerous class because the write target and size are attacker-influenced. The CPE wildcard version range indicates all LibreOffice versions prior to the fix are affected; the fix enforces rejection of any record carrying a duplicate change identifier.
RemediationAI
Upgrade to the fixed version of LibreOffice as released by The Document Foundation; the fix enforces rejection of spreadsheet records that assign the same change identifier to two different change types. The exact patched release version is not independently confirmed from available data - consult the vendor advisory at https://www.libreoffice.org/about-us/security/advisories/cve-2026-8358 for the specific version to target. As a compensating control while awaiting patching, organizations should instruct users not to open spreadsheet files with tracked changes from untrusted or unexpected sources; disabling tracked-changes import at the macro or policy level (where supported by deployment tooling) would eliminate the vulnerable code path but may disrupt legitimate collaborative workflows. Sandboxing LibreOffice via AppArmor, Flatpak, or equivalent container isolation limits the blast radius of heap exploitation to the sandboxed process rather than the full user session. Email gateway filtering of .ods and related spreadsheet formats from external senders can reduce the most common delivery vector without impacting internal document workflows.
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View allVendor StatusVendor
SUSE
Severity: Moderate| Product | Status |
|---|---|
| SUSE Linux Enterprise Desktop 15 SP7 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | Affected |
| SUSE Linux Enterprise Server 15 SP5 | Affected |
| SUSE Linux Enterprise Server 15 SP6 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP5 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP6 | Affected |
| openSUSE Leap 15.5 | Affected |
| openSUSE Leap 15.6 | Affected |
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External POC / Exploit Code
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