CVE-2026-63273— Heap buffer overflow in PDF import encryption handling
一分钟漏洞结论
影响对象
The Document Foundation LibreOffice
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing an encrypted document. The length of the decryption key was taken from the document's own encryption dictionary and was used to fill a fixed size key buffer without being
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| The Document Foundation | LibreOffice | 26.2< < 26.2.5 |
affected |
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一、 漏洞 CVE-2026-63273 基础信息
漏洞信息
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Vulnerability Title
Heap buffer overflow in PDF import encryption handling
来源: CVE Program / CVE List V5
Vulnerability Description
LibreOffice Draw can import PDF documents. A heap buffer overflow existed when importing an encrypted document. The length of the decryption key was taken from the document's own encryption dictionary and was used to fill a fixed size key buffer without being checked against it, so a length larger than that buffer wrote past its end. In fixed versions a declared key length larger than the buffer is rejected.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| The Document Foundation | LibreOffice | 26.2 ~ < 26.2.5 | - |
|
二、漏洞 CVE-2026-63273 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-63273 其他参考 (1)
同批安全公告 · The Document Foundation · 2026-09-22 · 共 7 条
| CVE-2026-63278 | 6.7 MEDIUM | Package URLs can be used to exfiltrate arbitrary INI file values and environment variables |
| CVE-2026-63279 | 5.4 MEDIUM | Out of bounds read in PICT image import |
| CVE-2026-63272 | 5.4 MEDIUM | Heap buffer overflow in WMF text record import |
| CVE-2026-63274 | 5.4 MEDIUM | Heap buffer overflow in PDF import stream handling |
| CVE-2026-63276 | 5.4 MEDIUM | Stack buffer overflow in CFF to Type 1 font conversion |
| CVE-2026-63275 | 5.4 MEDIUM | Stack buffer overflow in CFF font hint handling |
IV. Related Vulnerabilities
Same product: LibreOffice
-
CVE-2026-63279
Out of bounds read in PICT image import -
CVE-2026-63278
Package URLs can be used to exfiltrate arbitrary INI file va -
CVE-2026-63276
Stack buffer overflow in CFF to Type 1 font conversion -
CVE-2026-63275
Stack buffer overflow in CFF font hint handling -
CVE-2026-63274
Heap buffer overflow in PDF import stream handling
Same vendor: The Document Foundation
-
CVE-2026-63279
Out of bounds read in PICT image import -
CVE-2026-63278
Package URLs can be used to exfiltrate arbitrary INI file va -
CVE-2026-63276
Stack buffer overflow in CFF to Type 1 font conversion -
CVE-2026-63275
Stack buffer overflow in CFF font hint handling -
CVE-2026-63274
Heap buffer overflow in PDF import stream handling
Same weakness: CWE-787
-
CVE-2026-87121
Out-of-bounds write in lwIP TCP/IP Stack MQTT Client Applica -
CVE-2026-83963
Substance3D - Modeler | Out-of-bounds Write (CWE-787) -
CVE-2026-81998
Substance3D - Modeler | Out-of-bounds Write (CWE-787) -
CVE-2026-79906
Substance3D - Modeler | Out-of-bounds Write (CWE-787) -
CVE-2026-75658
Bridge | Out-of-bounds Write (CWE-787)
V. Comments for CVE-2026-63273
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