EUVD-2026-36738
GHSA-8r7p-3qw5-wxm5
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-based local attack requires user to open the PPT (AV:L/UI:R); no attacker privileges needed (PR:N); stack overflow primarily causes crash (A:H) with limited but plausible code-execution potential (C:L/I:L); no scope change (S:U).
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 can import presentations in the legacy binary PPT format. A stack buffer overflow existed when importing a colour-replacement record. Two fixed-size colour tables were filled from the file, but the write position was not reset between the two passes over the record, so a file whose combined colour counts exceeded the table size wrote past the end of the tables on the stack. In fixed versions the unused second pass is no longer read into those tables.
AnalysisAI
Stack buffer overflow in LibreOffice's legacy binary PPT importer allows a crafted presentation file to corrupt stack memory, causing application crash or potential arbitrary code execution under the victim's user context. The flaw affects all LibreOffice versions when importing PPT files containing a colour-replacement record whose combined colour counts across two parsing passes exceed the fixed-size stack-allocated colour tables. No public exploit has been confirmed actively exploited (not in CISA KEV), though the CVSS 4.0 supplemental E:P metric indicates proof-of-concept code exists, elevating this above a purely theoretical risk.
Technical ContextAI
LibreOffice implements a parser for the legacy binary PPT (PowerPoint 97-2003) format as part of its office document import subsystem. The vulnerable component processes colour-replacement records within PPT files by populating two fixed-size colour tables allocated on the stack. The root cause (CWE-787: Out-of-bounds Write) is a missing write-position reset between two sequential passes over the same record: the first pass fills the initial colour table, and the second pass continues writing from where the first left off rather than resetting to the start of the second table. When the combined colour entry count across both passes exceeds the allocated table capacity, the parser writes past the end of the stack-allocated buffers, corrupting adjacent stack frames. The vendor's fix eliminates the redundant second pass entirely, preventing the overflow. Affected scope per CPE cpe:2.3:a:the_document_foundation:libreoffice:*:*:*:*:*:*:*:* covers all LibreOffice versions prior to the fix across all supported platforms.
RemediationAI
Apply the vendor-released patch per the LibreOffice security advisory at https://www.libreoffice.org/about-us/security/advisories/cve-2026-8356; the exact fixed version must be confirmed directly from that advisory, as it was not included in the available data. The fix removes the erroneous second pass in the colour-replacement record parser, eliminating the overflow entirely. As an interim compensating control, instruct users to avoid opening unsolicited or untrusted PPT (legacy binary PowerPoint) files directly in LibreOffice; converting documents via a sandboxed or server-side conversion service before end-user access reduces exposure without impacting productivity significantly. Opening documents in LibreOffice's Protected View or within an application sandbox (e.g., Flatpak with restricted filesystem access) limits the impact of a successful exploit to the sandboxed process. Note that blocking PPT files at the email gateway or web proxy may cause compatibility issues for workflows dependent on legacy format exchange.
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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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