CVE-2026-6039

Application crash via truncated DXF point count

Published Jun 15, 2026 · Updated Jun 15, 2026

Heap buffer overflow in LibreOffice 25.8 before 25.8.7 and 26.2 before 26.2.3 allows attackers to corrupt memory via a crafted DXF file. The importer truncates the file-supplied polyline point count to 16 bits when allocating the point buffer, then fills it using the full count and writes beyond the allocation. Exploitation requires a user or automated workflow to import the crafted file; the resulting memory corruption can crash LibreOffice or alter data within its process.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in LibreOffice 25.8 before 25.8.7 and 26.2 before 26.2.3 allows attackers to corrupt memory via a crafted DXF file. The importer truncates the file-supplied polyline point count to 16 bits when allocating the point buffer, then fills it using the full count and writes beyond the allocation. Exploitation requires a user or automated workflow to import the crafted file; the resulting memory corruption can crash LibreOffice or alter data within its process.

The record

CVE
CVE-2026-6039
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
The Document Foundation
Product
LibreOffice
Classifications
CWE-787, CWE-197, CAPEC-44, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.8 << 25.8.7
  2. Affected versionversion=26.2 << 26.2.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Document Foundation · LibreOfficeversion=25.8 << 25.8.7; version=26.2 << 26.2.3

Published CVSS scores

5.4The Document FoundationCVSS: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
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-197Numeric Truncation Error
CAPEC-44Overflow Binary Resource File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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