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CVE-2026-6045— Heap buffer overflow in EMF+ gradient brush import

Quick assessment

Affected
The Document Foundation LibreOffice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The Document Foundation LibreOffice是The Document Foundation的办公套件。 The Document Foundation LibreOffice存在安全漏洞，该漏洞源于导入EMF+渐变画笔时存在堆缓冲区溢出，渐变混合点数从文件中读取并用于计算分配大小，但乘法可能溢出，导致分配小缓冲区后超限写入。

CVSS 5.4 · Medium EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
The Document Foundation LibreOffice 25.8< < 25.8.7 affected
26.2< < 26.2.3 affected
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I. Basic Information for CVE-2026-6045

Vulnerability Information
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Vulnerability Title
Heap buffer overflow in EMF+ gradient brush import
Source: CVE Program / CVE List V5
Vulnerability Description
LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
The Document Foundation LibreOffice 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Document Foundation LibreOffice是The Document Foundation的办公套件。 The Document Foundation LibreOffice存在安全漏洞，该漏洞源于导入EMF+渐变画笔时存在堆缓冲区溢出，渐变混合点数从文件中读取并用于计算分配大小，但乘法可能溢出，导致分配小缓冲区后超限写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Document Foundation LibreOffice 25.8 ~ < 25.8.7 -

II. Public POCs for CVE-2026-6045

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III. Intelligence Information for CVE-2026-6045

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Vendor Advisories for CVE-2026-6045 (1)

Same Patch Batch · The Document Foundation · 2026-06-15 · 7 CVEs total

CVE-2026-6040 5.4 MEDIUM Heap use-after-free in ODF number-format blank-width parsing
CVE-2026-8357 5.4 MEDIUM Heap buffer overflow in Calc formula compilation
CVE-2026-6039 Heap buffer overflow in DXF polyline import
CVE-2026-6047 Heap buffer overflow in OOXML text box element import
CVE-2026-8358 Heap buffer overflow in spreadsheet tracked-changes import
CVE-2026-8356 Stack buffer overflow in PPT presentation import

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: The Document Foundation
Same weakness: CWE-787

V. Comments for CVE-2026-6045

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