CVE-2026-6040— Heap use-after-free in ODF number-format blank-width parsing
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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-2026-6040
Vulnerability Information
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Vulnerability Title
Heap use-after-free in ODF number-format blank-width parsing
Source: CVE Program / CVE List V5
Vulnerability Description
A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the document was not checked against the length of the format-code string, so a malformed number format could be processed against memory outside that string. In fixed versions the position is bounds-checked before use.
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
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
The Document Foundation LibreOffice 资源管理错误漏洞
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，该漏洞源于在导入ODF数字格式的空格字符时存在堆释放后重用问题，未检查文件中读取的位置值是否超出格式码字符串长度，导致畸形数字格式可能处理字符串外部的内存。
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-2026-6040
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-6040 (1)
Same Patch Batch · The Document Foundation · 2026-06-15 · 7 CVEs total
| 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-2026-6045 | Heap buffer overflow in EMF+ gradient brush 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
- CVE-2026-8358
Heap buffer overflow in spreadsheet tracked-changes import - CVE-2026-8357
Heap buffer overflow in Calc formula compilation - CVE-2026-8356
Stack buffer overflow in PPT presentation import - CVE-2026-6047
Heap buffer overflow in OOXML text box element import - CVE-2026-6045
Heap buffer overflow in EMF+ gradient brush import
Same vendor: The Document Foundation
- CVE-2026-8358
Heap buffer overflow in spreadsheet tracked-changes import - CVE-2026-8357
Heap buffer overflow in Calc formula compilation - CVE-2026-8356
Stack buffer overflow in PPT presentation import - CVE-2026-6047
Heap buffer overflow in OOXML text box element import - CVE-2026-6045
Heap buffer overflow in EMF+ gradient brush import
Same weakness: CWE-416
- CVE-2026-49306
time模块UAF漏洞，影响可用性 - CVE-2026-12366
Use-after-free freeing an armed dynamically-allocated k_time - CVE-2026-12365
Use-after-free in Zephyr delayable work-queue cancellation u - CVE-2026-11937
Security vulnerabilities have been found in IBM Verify Ident - CVE-2026-19548
Binutils: binutils: multiple use-after-free in add_archive_e
V. Comments for CVE-2026-6040
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